WO2016024618A1 - Transparent adhesive sheet - Google Patents
Transparent adhesive sheet Download PDFInfo
- Publication number
- WO2016024618A1 WO2016024618A1 PCT/JP2015/072865 JP2015072865W WO2016024618A1 WO 2016024618 A1 WO2016024618 A1 WO 2016024618A1 JP 2015072865 W JP2015072865 W JP 2015072865W WO 2016024618 A1 WO2016024618 A1 WO 2016024618A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- meth
- acrylate
- adhesive sheet
- sensitive adhesive
- pressure
- Prior art date
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- 230000001070 adhesive effect Effects 0.000 title claims abstract description 84
- 239000000853 adhesive Substances 0.000 title claims abstract description 83
- 239000000203 mixture Substances 0.000 claims abstract description 82
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 52
- 239000003999 initiator Substances 0.000 claims abstract description 34
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 32
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 10
- 238000002835 absorbance Methods 0.000 claims abstract description 8
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 123
- 239000000178 monomer Substances 0.000 claims description 94
- 229920006243 acrylic copolymer Polymers 0.000 claims description 33
- 230000009477 glass transition Effects 0.000 claims description 31
- 239000012943 hotmelt Substances 0.000 claims description 18
- 238000002834 transmittance Methods 0.000 claims description 18
- 229920006163 vinyl copolymer Polymers 0.000 claims description 16
- 229920005989 resin Polymers 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 229920003067 (meth)acrylic acid ester copolymer Polymers 0.000 claims description 8
- 229920000578 graft copolymer Polymers 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 36
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 232
- -1 2-ethylhexyl Chemical group 0.000 description 66
- 229920006223 adhesive resin Polymers 0.000 description 29
- 238000004132 cross linking Methods 0.000 description 26
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 21
- 239000004840 adhesive resin Substances 0.000 description 21
- 229920001577 copolymer Polymers 0.000 description 21
- 239000010410 layer Substances 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 18
- 239000011342 resin composition Substances 0.000 description 17
- 229920005601 base polymer Polymers 0.000 description 16
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 15
- 125000004432 carbon atom Chemical group C* 0.000 description 15
- 229920002554 vinyl polymer Polymers 0.000 description 14
- AIXZBGVLNVRQSS-UHFFFAOYSA-N 5-tert-butyl-2-[5-(5-tert-butyl-1,3-benzoxazol-2-yl)thiophen-2-yl]-1,3-benzoxazole Chemical compound CC(C)(C)C1=CC=C2OC(C3=CC=C(S3)C=3OC4=CC=C(C=C4N=3)C(C)(C)C)=NC2=C1 AIXZBGVLNVRQSS-UHFFFAOYSA-N 0.000 description 13
- 239000000470 constituent Substances 0.000 description 12
- 239000007788 liquid Substances 0.000 description 12
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 239000005361 soda-lime glass Substances 0.000 description 11
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 10
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 9
- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 description 8
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 8
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 8
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 8
- 125000000524 functional group Chemical group 0.000 description 8
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 7
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 7
- 238000003860 storage Methods 0.000 description 7
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 6
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 6
- 125000000217 alkyl group Chemical group 0.000 description 6
- 238000003776 cleavage reaction Methods 0.000 description 6
- 238000007334 copolymerization reaction Methods 0.000 description 6
- 125000006841 cyclic skeleton Chemical group 0.000 description 6
- 238000011049 filling Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 230000002209 hydrophobic effect Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 230000007017 scission Effects 0.000 description 6
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 5
- 229920001515 polyalkylene glycol Polymers 0.000 description 5
- 239000003505 polymerization initiator Substances 0.000 description 5
- 150000003254 radicals Chemical class 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 5
- 230000002087 whitening effect Effects 0.000 description 5
- DTGKSKDOIYIVQL-WEDXCCLWSA-N (+)-borneol Chemical group C1C[C@@]2(C)[C@@H](O)C[C@@H]1C2(C)C DTGKSKDOIYIVQL-WEDXCCLWSA-N 0.000 description 4
- 229920002799 BoPET Polymers 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 4
- PXKLMJQFEQBVLD-UHFFFAOYSA-N bisphenol F Chemical compound C1=CC(O)=CC=C1CC1=CC=C(O)C=C1 PXKLMJQFEQBVLD-UHFFFAOYSA-N 0.000 description 4
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 235000011187 glycerol Nutrition 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 4
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 4
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 4
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 4
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 4
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 3
- DXIJHCSGLOHNES-UHFFFAOYSA-N 3,3-dimethylbut-1-enylbenzene Chemical compound CC(C)(C)C=CC1=CC=CC=C1 DXIJHCSGLOHNES-UHFFFAOYSA-N 0.000 description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Natural products OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 3
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 3
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 3
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 3
- 239000012790 adhesive layer Substances 0.000 description 3
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 3
- 125000002511 behenyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 3
- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 description 3
- 238000001723 curing Methods 0.000 description 3
- 125000002704 decyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 3
- VFHVQBAGLAREND-UHFFFAOYSA-N diphenylphosphoryl-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C1=CC=CC=C1 VFHVQBAGLAREND-UHFFFAOYSA-N 0.000 description 3
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 3
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 3
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 3
- 125000001972 isopentyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 description 3
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 3
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 3
- 239000011976 maleic acid Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 125000005395 methacrylic acid group Chemical group 0.000 description 3
- 125000001971 neopentyl group Chemical group [H]C([*])([H])C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 3
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 3
- 238000000016 photochemical curing Methods 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 description 3
- 230000009257 reactivity Effects 0.000 description 3
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 3
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- MMEJYPZZFYTVLJ-WAYWQWQTSA-N (z)-2-(2-prop-2-enoyloxyethyl)but-2-enedioic acid Chemical compound OC(=O)\C=C(C(O)=O)\CCOC(=O)C=C MMEJYPZZFYTVLJ-WAYWQWQTSA-N 0.000 description 2
- ALVZNPYWJMLXKV-UHFFFAOYSA-N 1,9-Nonanediol Chemical compound OCCCCCCCCCO ALVZNPYWJMLXKV-UHFFFAOYSA-N 0.000 description 2
- NQUXRXBRYDZZDL-UHFFFAOYSA-N 1-(2-prop-2-enoyloxyethyl)cyclohexane-1,2-dicarboxylic acid Chemical compound OC(=O)C1CCCCC1(CCOC(=O)C=C)C(O)=O NQUXRXBRYDZZDL-UHFFFAOYSA-N 0.000 description 2
- PWMLMBQHHBLIQM-UHFFFAOYSA-N 1-(3-prop-2-enoyloxypropyl)cyclohexane-1,2-dicarboxylic acid Chemical compound OC(=O)C1CCCCC1(CCCOC(=O)C=C)C(O)=O PWMLMBQHHBLIQM-UHFFFAOYSA-N 0.000 description 2
- IEQWWMKDFZUMMU-UHFFFAOYSA-N 2-(2-prop-2-enoyloxyethyl)butanedioic acid Chemical compound OC(=O)CC(C(O)=O)CCOC(=O)C=C IEQWWMKDFZUMMU-UHFFFAOYSA-N 0.000 description 2
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 2
- WLIVGKZSWFDOQX-UHFFFAOYSA-N 2-(3-prop-2-enoyloxypropyl)butanedioic acid Chemical compound C(C=C)(=O)OCCCC(C(=O)O)CC(=O)O WLIVGKZSWFDOQX-UHFFFAOYSA-N 0.000 description 2
- WMYINDVYGQKYMI-UHFFFAOYSA-N 2-[2,2-bis(hydroxymethyl)butoxymethyl]-2-ethylpropane-1,3-diol Chemical compound CCC(CO)(CO)COCC(CC)(CO)CO WMYINDVYGQKYMI-UHFFFAOYSA-N 0.000 description 2
- PTJWCLYPVFJWMP-UHFFFAOYSA-N 2-[[3-hydroxy-2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)COCC(CO)(CO)CO PTJWCLYPVFJWMP-UHFFFAOYSA-N 0.000 description 2
- NJWGQARXZDRHCD-UHFFFAOYSA-N 2-methylanthraquinone Chemical compound C1=CC=C2C(=O)C3=CC(C)=CC=C3C(=O)C2=C1 NJWGQARXZDRHCD-UHFFFAOYSA-N 0.000 description 2
- UPTHZKIDNHJFKQ-UHFFFAOYSA-N 2-methylprop-2-enoic acid;propane-1,2,3-triol Chemical compound CC(=C)C(O)=O.CC(=C)C(O)=O.OCC(O)CO UPTHZKIDNHJFKQ-UHFFFAOYSA-N 0.000 description 2
- UXTGJIIBLZIQPK-UHFFFAOYSA-N 3-(2-prop-2-enoyloxyethyl)phthalic acid Chemical compound OC(=O)C1=CC=CC(CCOC(=O)C=C)=C1C(O)=O UXTGJIIBLZIQPK-UHFFFAOYSA-N 0.000 description 2
- RCXHRHWRRACBTK-UHFFFAOYSA-N 3-(oxiran-2-ylmethoxy)propane-1,2-diol Chemical compound OCC(O)COCC1CO1 RCXHRHWRRACBTK-UHFFFAOYSA-N 0.000 description 2
- OFNISBHGPNMTMS-UHFFFAOYSA-N 3-methylideneoxolane-2,5-dione Chemical compound C=C1CC(=O)OC1=O OFNISBHGPNMTMS-UHFFFAOYSA-N 0.000 description 2
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 description 2
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- GYCMBHHDWRMZGG-UHFFFAOYSA-N Methylacrylonitrile Chemical compound CC(=C)C#N GYCMBHHDWRMZGG-UHFFFAOYSA-N 0.000 description 2
- HLJYBXJFKDDIBI-UHFFFAOYSA-N O=[PH2]C(=O)C1=CC=CC=C1 Chemical compound O=[PH2]C(=O)C1=CC=CC=C1 HLJYBXJFKDDIBI-UHFFFAOYSA-N 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 2
- 239000007983 Tris buffer Substances 0.000 description 2
- IAXXETNIOYFMLW-COPLHBTASA-N [(1s,3s,4s)-4,7,7-trimethyl-3-bicyclo[2.2.1]heptanyl] 2-methylprop-2-enoate Chemical compound C1C[C@]2(C)[C@@H](OC(=O)C(=C)C)C[C@H]1C2(C)C IAXXETNIOYFMLW-COPLHBTASA-N 0.000 description 2
- GUCYFKSBFREPBC-UHFFFAOYSA-N [phenyl-(2,4,6-trimethylbenzoyl)phosphoryl]-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C(=O)C1=C(C)C=C(C)C=C1C GUCYFKSBFREPBC-UHFFFAOYSA-N 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 125000004018 acid anhydride group Chemical group 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 230000003712 anti-aging effect Effects 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 2
- 239000007809 chemical reaction catalyst Substances 0.000 description 2
- 238000004581 coalescence Methods 0.000 description 2
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000006356 dehydrogenation reaction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- YLGZRMLFAGSRHM-UHFFFAOYSA-N dodecanoic acid;tin Chemical compound [Sn].CCCCCCCCCCCC(O)=O YLGZRMLFAGSRHM-UHFFFAOYSA-N 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- UIWXSTHGICQLQT-UHFFFAOYSA-N ethenyl propanoate Chemical compound CCC(=O)OC=C UIWXSTHGICQLQT-UHFFFAOYSA-N 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 239000001530 fumaric acid Substances 0.000 description 2
- NKHAVTQWNUWKEO-UHFFFAOYSA-N fumaric acid monomethyl ester Natural products COC(=O)C=CC(O)=O NKHAVTQWNUWKEO-UHFFFAOYSA-N 0.000 description 2
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 2
- 229920001519 homopolymer Polymers 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 239000003230 hygroscopic agent Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/10—Adhesives in the form of films or foils without carriers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/04—Polymers provided for in subclasses C08C or C08F
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/04—Polymers provided for in subclasses C08C or C08F
- C08F290/046—Polymers of unsaturated carboxylic acids or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J129/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Adhesives based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/10—Homopolymers or copolymers of methacrylic acid esters
- C09J133/12—Homopolymers or copolymers of methyl methacrylate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
- C09J151/003—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J155/00—Adhesives based on homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C09J123/00 - C09J153/00
- C09J155/005—Homopolymers or copolymers obtained by polymerisation of macromolecular compounds terminated by a carbon-to-carbon double bond
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J201/00—Adhesives based on unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0041—Optical brightening agents, organic pigments
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/45—Heterocyclic compounds having sulfur in the ring
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/414—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of a copolymer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2451/00—Presence of graft polymer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
Definitions
- the present invention relates to a photocurable curable transparent adhesive sheet suitable for bonding image display device constituent members.
- an image display panel such as a liquid crystal display (LCD), a plasma display (PDP), an electroluminescence display (ELD), and a protection disposed on the front side (viewing side).
- Patent Document 1 As a method for filling the gap between the constituent members for an image display device with an adhesive, there is a method in which a liquid adhesive resin composition containing an ultraviolet curable resin is filled into the gap and then cured by irradiation with ultraviolet rays.
- Patent Document 1 a liquid adhesive resin composition containing an ultraviolet curable resin is filled into the gap and then cured by irradiation with ultraviolet rays.
- Patent Document 2 discloses a method in which a pressure-sensitive adhesive sheet that has undergone primary crosslinking with ultraviolet rays is bonded to an image display device constituent member, and then the adhesive sheet is irradiated with ultraviolet rays through the image display device constituent member to be secondarily cured.
- Patent Document 3 discloses a pressure-sensitive adhesive sheet comprising a hot-melt adhesive composition having a loss tangent at 25 ° C. of less than 1 based on urethane (meth) acrylate having a weight average molecular weight of 20,000 to 100,000. And a method for filling a gap between constituent members for an image display device.
- Patent Document 4 Japanese Patent Application Laid-Open No.
- a liquid photocurable resin composition containing a photopolymerization initiator having a maximum absorption wavelength in the range of 370 to 420 nm and a phosphor is disclosed.
- the pressure-sensitive adhesive sheet that normally takes the form of a sheet is used for bonding the image display device constituent members, there is no serious problem that the pressure-sensitive adhesive leaks out even in an uncured state.
- the pressure-sensitive adhesive sheet is required to have flexibility and fluidity from the viewpoint of flexibly following a printing step forming the concealing portion and entering into every corner to alleviate distortion generated in the pressure-sensitive adhesive sheet.
- the present invention relates to a photocurable pressure-sensitive adhesive sheet that normally has a sheet shape, and can be photocured even if there is a place where light is difficult to reach, such as a print concealment portion, and is a pressure-sensitive adhesive sheet having a certain thickness. Even if it exists, it intends to provide the new adhesive sheet which can harden the whole sheet
- the present invention is excited by a thermoplastic resin (A), a crosslinking agent (B), a photopolymerization initiator (C) that reacts with light having a wavelength of at least 380 nm to 430 nm, and light having a wavelength shorter than 380 nm.
- a transparent pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive composition containing a wavelength conversion agent (D) that emits light of 380 nm to 550 nm, wherein the absorbance X of the pressure-sensitive adhesive sheet at a wavelength of 390 nm and the thickness Y of the pressure-sensitive adhesive sheet have the following relationship
- the transparent adhesive sheet characterized by satisfying Formula (1) is proposed.
- the wavelength converting agent (D) When the transparent adhesive sheet proposed by the present invention is irradiated with light having a wavelength shorter than 380 nm, for example, “ultraviolet rays”, the wavelength converting agent (D) is excited, and light having a wavelength of 380 nm to 550 nm, for example, “visible” Emits light. In this way, the wavelength conversion agent (D) emits visible light inside the pressure-sensitive adhesive sheet, so that the visible light reaches even if there is a place where the ultraviolet rays are difficult to reach, such as a print concealment part. ) Can be photocrosslinked and cured.
- the transparent pressure-sensitive adhesive sheet according to an example of the embodiment of the present invention includes a thermoplastic resin (A), a crosslinking agent (B), and light that reacts with light having a wavelength of at least 380 nm to 430 nm.
- a pressure-sensitive adhesive composition (“this pressure-sensitive adhesive composition") containing a polymerization initiator (C) and a wavelength conversion agent (D) that is excited by light having a wavelength shorter than 380 nm and emits light having a wavelength of 380 nm to 550 nm It is a transparent pressure-sensitive adhesive sheet.
- This pressure-sensitive adhesive sheet can maintain a sheet shape in a normal state, has a hot melt property that melts or flows when heated in an uncrosslinked state, and has a photocrosslinkable property that can be photocrosslinked. Is preferred. If the sheet shape can be maintained in a normal state, it is easy to handle as compared with the liquid adhesive, and the work of filling the liquid can be omitted, so that the productivity is particularly excellent. In addition, if it has a proper adhesiveness, for example, a peelable adhesiveness (referred to as “tackiness”) in the normal state, that is, near room temperature, positioning at the time of sticking is easy to perform, and it is very difficult to work. It is more preferable because it is convenient.
- tackiness a peelable adhesiveness
- the pressure-sensitive adhesive sheet has a hot melt property that softens or fluidizes when heated to 60 ° C. to 100 ° C.
- the shape can be maintained in the normal state, so that in the state before bonding in the normal state, it has excellent storage stability and handling properties related to handling such as cutting. It becomes.
- the image display device constituting member may be damaged by heating above 100 ° C. Therefore, the image display device constituting member can be prevented from being thermally damaged. .
- the pressure-sensitive adhesive sheet preferably has a hot-melt property that softens or fluidizes when heated to 60 to 100 ° C., particularly 63 ° C. or higher and 98 ° C. or lower, especially 65 ° C. or higher or higher. It is particularly preferable to have a hot melt property that softens or fluidizes when heated to 95 ° C. or lower.
- the pressure-sensitive adhesive sheet may be a single layer or a multilayer.
- the above properties that is, a sheet shape can be maintained in a normal state, and it has a hot melt property that melts or flows when heated in an uncrosslinked state, and A pressure-sensitive adhesive sheet that can be photocrosslinked is preferable.
- the thickness of the present pressure-sensitive adhesive sheet is preferably 50 ⁇ m to 1 mm, and more preferably 75 ⁇ m or more or 500 ⁇ m or less. If the thickness of this adhesive sheet is 50 micrometers or more, it is preferable at the point which can follow uneven
- the thickness of the pressure-sensitive adhesive sheet is more preferably 75 ⁇ m or more, particularly 100 ⁇ m from the viewpoint of higher printing height of the peripheral concealing layer in the conventional image display device, specifically filling a step of about 80 ⁇ m.
- the above is more preferable.
- it is preferably 500 ⁇ m or less, more preferably 350 ⁇ m or less.
- the pressure-sensitive adhesive sheet preferably satisfies the following (1) and (2) in a state before crosslinking.
- (1) With respect to a sheet having a thickness of 150 ⁇ m made of the transparent adhesive material before crosslinking, the displacement length at a temperature of 40 ° C. with respect to the SUS plate is less than 5 mm in the holding power measurement performed according to JIS-Z-0237.
- (2) For a sheet having a thickness of 150 ⁇ m made of the transparent adhesive material before cross-linking, the displacement length at a temperature of 80 ° C. with respect to the SUS plate is 10 mm or more in the holding force measurement performed according to JIS-Z-0237.
- the deviation length at a temperature of 40 ° C. is less than 5 mm in the state before crosslinking, excellent shape stability and processing suitability can be exhibited in the normal state before heating. it can.
- the deviation length at a temperature of 80 ° C. is 10 mm or more in the state before crosslinking, not only a relatively small laminate of 2 to 4 inches, for example, Even in a laminate having a relatively large size of 7 inches or more, the bonded member can be easily separated by heating to 60 ° C. to 100 ° C.
- the pressure-sensitive adhesive sheet preferably satisfies the following (3) and (4) in a state before crosslinking.
- (3) A 150 ⁇ m thick adhesive sheet made of the transparent adhesive material before cross-linking is placed on soda lime glass, and a 2 kg roll is reciprocated once, and immediately after roll pressure bonding, a peeling angle of 180 ° is peeled off at 23 ° C. 180 ° peeling force when the adhesive sheet is peeled off from soda lime glass at a speed of 60 mm / min is 5 N / cm or more.
- a 150 ⁇ m-thick adhesive sheet made of the transparent adhesive material before cross-linking is placed on soda lime glass, and a 2 kg roll is reciprocated once, and immediately after roll pressure bonding, a peeling angle of 180 ° is peeled off at 85 ° C.
- the 180 ° peeling force when the adhesive sheet is peeled off from soda lime glass at a speed of 60 mm / min is less than 2 N / cm.
- the adhesiveness (“ If such tackiness is provided, positioning at the time of bonding is easy, which is very convenient for work.
- the 180 ° peeling force at a temperature of 85 ° C. is less than 2N in the state before cross-linking, excellent re-peelability at the time of heating is imparted to the member after pasting. can do.
- the pressure-sensitive adhesive sheet preferably satisfies the following (5) and (6) after crosslinking.
- (5) After a 150 ⁇ m-thick adhesive sheet made of the transparent adhesive material before cross-linking is placed on soda lime glass, a 2 kg roll is reciprocated once and roll-bonded, and then light having a wavelength of 365 nm is applied to the transparent adhesive layer. in a state but which were crosslinked to the transparent adhesive material is irradiated with light to 2000 mJ / cm 2 reaches, peeling angle 180 ° at a temperature 23 ° C., at a peel rate of 60 mm / min, the pressure-sensitive adhesive sheet of soda-lime glass 180 ° peeling force when peeled off is 5 N / cm or more.
- a 150 ⁇ m-thick adhesive sheet made of the transparent adhesive material before cross-linking is placed on soda lime glass, a 2 kg roll is reciprocated once and roll-bonded, and then light having a wavelength of 365 nm is applied to the transparent adhesive layer. in a state but which were crosslinked to the transparent adhesive material is irradiated with light to 2000 mJ / cm 2 reaches, peeling angle 180 ° at a temperature 85 ° C., at a peel rate of 60 mm / min, the pressure-sensitive adhesive sheet of soda-lime glass 180 ° peeling force when peeled off is 5 N / cm or more.
- the 180 ° peeling force at a temperature of 23 ° C. is 5 N / cm or more in the state after crosslinking, the reliability of the bonded laminate can be secured against peeling in a normal state. preferable.
- the 180 ° peeling force at a temperature of 83 ° C. is 5 N / cm or more in the state after crosslinking, a laminate having excellent durability can be obtained.
- the photopolymerization initiator (C) and the wavelength conversion agent (D) will be described.
- Photopolymerization initiator (C) Any photopolymerization initiator (C) may be used as long as it generates radicals upon irradiation with light having a wavelength of 380 nm to 430 nm and serves as a starting point for the polymerization reaction of the base resin.
- the meaning of “react with light having a wavelength of 380 nm to 430 nm” means that the reaction should be performed with light having any wavelength in the wavelength range of 380 nm to 430 nm. It is allowed to react. Conceptually, it means that if it reacts with light having a wavelength in the visible light region, it may react with ultraviolet rays.
- the reactive radical generation mechanism of the photopolymerization initiator is roughly classified into two types: a cleavage type that cleaves its own covalent bond and decomposes to generate radicals, and a hydrogen donor in the system that draws and excites hydrogen. It is classified as a hydrogen abstraction type that generates radicals.
- the photopolymerization initiator (C) Any of these may be used as the photopolymerization initiator (C), but a cleavage type is particularly preferred.
- the cleavage type decomposes when a radical is generated by light irradiation to form another compound, and once excited, it does not function as a reaction initiator. For this reason, when the cleavage mold is used as the photopolymerization initiator (C) that reacts with light having a wavelength of 380 nm to 430 nm, the light is applied to the pressure-sensitive adhesive sheet after the light irradiation to the pressure-sensitive adhesive sheet as compared with the case of using the hydrogen abstraction mold.
- the polymerization initiator (C) becomes a reaction decomposition product, absorption in the region of 380 nm to 430 nm is lost, and irradiation light more easily reaches the deep part of the pressure-sensitive adhesive sheet. Therefore, it is preferable to use a cleavage type photopolymerization initiator as the photopolymerization initiator (C).
- Examples of the photopolymerization initiator (C) include 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butan-1-one and 2- (4-methylbenzyl) -2-dimethylamino-1.
- -(4-morpholinophenyl) butan-1-one bis ( ⁇ 5-2,4-cyclopentadien-1-yl) -bis (2,6-difluoro-3- (1H-pyrrol-1-yl) phenyl ) Titanium, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, thioxanthone, 2-chlorothioxanthone, 3-methylthioxanthone, 2,4-dimethyl Thioxanthone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylan Rakinon, 2-amino
- cleavage type photopolymerization initiator is a bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, 2,4,6- Trimethylbenzoyldiphenylphosphine oxide is preferred.
- a sensitizer In order to adjust the reactivity of the photopolymerization initiator (C), a sensitizer can be used in combination.
- the sensitizer include various amines and compounds such as anthraquinone and thioxanthone. Among these, amine-based sensitizers are preferable in that they are excellent in solubility in the pressure-sensitive adhesive composition and do not impair ultraviolet light transmittance.
- the wavelength converting agent (D) is preferably one that is excited by light having a wavelength shorter than 380 nm and emits light having a wavelength of at least 380 nm to 550 nm. What is necessary is just to be excited with the light of the shorter wavelength side than wavelength 380 nm, and what contains the light of the shorter wavelength side than wavelength 370 nm as an excitation area
- examples of preferable wavelength conversion agent (D) include oxazole phosphors, triazole phosphors, thiophene fluorescence, and the like. One of these, or two or more of these may be used. They can be used in combination.
- the wavelength conversion agent (D) is preferably a material that is compatible with the thermoplastic resin (A). If the wavelength converting agent (D) is a material compatible with the thermoplastic resin (A), the transparency can be further enhanced. From this viewpoint, an organic phosphor is preferable.
- the concentration of the wavelength converting agent (D) and the pressure-sensitive adhesive sheet so that the absorbance X at a wavelength of 390 nm of the pressure-sensitive adhesive sheet and the thickness Y of the pressure-sensitive adhesive sheet satisfy the following relational expression (1). It is preferable to adjust the thickness and the like.
- the transmittance of the pressure-sensitive adhesive sheet at a wavelength of 390 nm is 3 to 95%, particularly 5% or more and 85% or less, of which 7% or 80% or less. It is preferable to adjust the concentration of the conversion agent (D).
- This pressure-sensitive adhesive sheet may be a pressure-sensitive adhesive sheet with a release film provided with a release film on one side or both sides.
- the release film used in the present adhesive sheet is such that at least the release film on one side of the front and back sides has a light transmittance of 40% or less, particularly 35% or less, particularly 30% or less of light having a wavelength shorter than 380 nm.
- Particularly preferred is a film. If the release film is a film having a light transmittance of 40% or less for light having a wavelength shorter than 380 nm, the light for starting the reaction can be blocked to some extent. While the reaction start of (C) can be suppressed, excitation of the wavelength converting agent (D) can be suppressed.
- Examples of the release film having a light transmittance of 40% or less of light having a wavelength shorter than 380 nm include, for example, a film containing an ultraviolet absorber, a film coated or printed with an ultraviolet absorber, and an ultraviolet absorber.
- a film formed by laminating layers, a paper release film, and the like can be given.
- This pressure-sensitive adhesive sheet can be preferably used for bonding image display device constituting members constituting the image display device, for example.
- the application of the present adhesive sheet is not limited to such an application.
- Examples of such an image display device include a personal computer, a mobile terminal (PDA), a game machine, a television (TV), a car navigation system, a touch panel, and a pen tablet. However, it is not limited to these.
- the image display device constituting member examples include a touch panel, an image display panel, a surface protection panel, a retardation film, a polarizing film, and the like, and any of these may be used.
- a laminate in which two or more of these are already laminated may be used. However, it is not limited to these.
- pressure-sensitive adhesive compositions (I) and (II) As preferred examples of the above-mentioned pressure-sensitive adhesive composition, pressure-sensitive adhesive compositions (I) and (II) will be described. However, the present pressure-sensitive adhesive composition is not limited to the following pressure-sensitive adhesive compositions (I) and (II).
- the outermost layer preferably has both uneven followability and foam resistance reliability as in the case of the single layer. It is preferable to form the product using, for example, the pressure-sensitive adhesive compositions (I) and (II).
- the intermediate layer since the intermediate layer does not contribute to adhesion with the image display device constituent member, it does not impair the transparency, and has a light transmittance that does not hinder the secondary curing reaction of the outermost layer, and has a cutting property. In addition, it preferably has a property of improving handling properties. If the kind of base polymer which forms an intermediate
- the base polymer forming the intermediate layer may be the same resin as the base polymer of the outermost layer or a different resin. Among these, it is preferable to use the same acrylic resin as the base polymer of the outermost layer from the viewpoints of ensuring transparency and ease of production, and preventing light refraction at the lamination boundary surface.
- the intermediate layer and other resin layers may or may not have active energy ray curability. For example, it may be formed so as to be cured by ultraviolet crosslinking or may be formed so as to be cured by heat. Further, it may be formed so as not to be post-cured. However, in consideration of adhesion to the outermost layer, etc., it is preferably formed so as to be post-cured, and particularly preferably formed so as to be UV-crosslinked.
- the laminated structure specifically includes, for example, two types and two layers in which pressure-sensitive adhesive compositions (I) and (II) and other pressure-sensitive adhesive compositions are stacked. Composition, two types and three layers with adhesive compositions (I) and (II) arranged on the front and back via an intermediate resin layer, adhesive compositions (I) and (II), and an intermediate resin composition And a three-layer three-layer structure in which other pressure-sensitive adhesive compositions are laminated in this order.
- Adhesive composition (I) As the pressure-sensitive adhesive composition (I), an acrylic copolymer (A1) comprising a graft copolymer having a macromonomer as a branch component, a crosslinking agent (B1), a photopolymerization initiator (C1), a wavelength
- A1 acrylic copolymer
- B1 crosslinking agent
- C1 photopolymerization initiator
- D1 wavelength
- D1 a conversion agent
- the acrylic copolymer (A1) may be a graft copolymer having a macromonomer as a branch component.
- the trunk component of the acrylic copolymer (A1) is preferably composed of a copolymer component containing a repeating unit derived from a (meth) acrylic acid ester.
- the glass transition temperature of the copolymer constituting the trunk component of the acrylic copolymer (A1) is preferably ⁇ 70 to 0 ° C.
- the glass transition temperature of the copolymer component constituting the trunk component refers to the glass transition temperature of the polymer obtained by copolymerizing only the monomer component constituting the trunk component of the acrylic copolymer (A1). .
- it means a value calculated by the Fox formula from the glass transition temperature and the composition ratio of the polymer obtained from the homopolymer of each component of the copolymer.
- the calculation formula of Fox is a calculation value calculated
- the glass transition temperature of the copolymer component constituting the trunk component of the acrylic copolymer (A1) is the flexibility of the pressure-sensitive adhesive composition (I) at room temperature and the pressure-sensitive adhesive composition to the adherend. Since the adhesive composition (I) affects the wettability of (I), that is, the adhesiveness, the glass transition temperature is ⁇ 70 ° C. to obtain an appropriate adhesive property (tackiness) at room temperature. It is preferably 0 ° C., more preferably ⁇ 65 ° C. or higher or ⁇ 5 ° C. or lower, and particularly preferably ⁇ 60 ° C. or higher or ⁇ 10 ° C. or lower.
- the viscoelasticity can be adjusted by adjusting the molecular weight. For example, it can be made more flexible by reducing the molecular weight of the copolymer component.
- Examples of the (meth) acrylic acid ester monomer contained in the main component of the acrylic copolymer (A1) include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, sec-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, isopentyl (meth) acrylate, neopentyl (meth) acrylate, hexyl ( (Meth) acrylate, cyclohexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (me
- hydroxyl-containing (meth) acrylates such as hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, and glycerol (meth) acrylate having a hydrophilic group or an organic functional group, ) Acrylic acid, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, 2- (meth) acryloyloxypropyl hexahydrophthalic acid, 2- (meth) acryloyloxyethyl phthalic acid, 2- (meth) acryloyloxypropyl phthalate Acid, 2- (meth) acryloyloxyethylmaleic acid, 2- (meth) acryloyloxypropylmaleic acid, 2- (meth) acryloyloxyethylsuccinic acid, 2- (meth) acryloyloxypropylsuccinic acid, cro
- vinyl monomers such as vinyl monomers can also be used as appropriate.
- the trunk component of the acrylic copolymer (A1) contains a hydrophobic (meth) acrylate monomer and a hydrophilic (meth) acrylate monomer as constituent units. If the trunk component of the acrylic copolymer (A1) is composed only of a hydrophobic monomer, a tendency to wet-heat whitening is recognized. Therefore, it is preferable to introduce a hydrophilic monomer into the trunk component to prevent wet-heat whitening. .
- the acrylic copolymer (A1) a hydrophobic (meth) acrylate monomer, a hydrophilic (meth) acrylate monomer, and a polymerizable functional group at the terminal of the macromonomer are included.
- the copolymer component formed by random copolymerization can be mentioned.
- examples of the hydrophobic (meth) acrylate monomer include n-butyl (meth) acrylate, isobutyl (meth) acrylate, sec-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) ) Acrylate, isopentyl (meth) acrylate, neopentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (Meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, t-butylcyclohexyl (meth) acrylate, decyl (meth)
- hydrophilic (meth) acrylate monomer examples include methyl (meth) acrylate, (meth) acrylic acid, tetrahydrofurfuryl (meth) acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxy Hydroxyl-containing (meth) acrylates such as butyl (meth) acrylate and glycerol (meth) acrylate, (meth) acrylic acid, 2- (meth) acryloyloxyethylhexahydrophthalic acid, 2- (meth) acryloyloxypropylhexahydro Phthalic acid, 2- (meth) acryloyloxyethyl phthalic acid, 2- (meth) acryloyloxypropyl phthalic acid, 2- (meth) acryloyloxyethyl maleic acid, 2- (meth) acryloyloxypropyl maleic acid Carboxyl group-containing
- the acrylic copolymer (A1) is important for the acrylic copolymer (A1) to introduce a macromonomer as a branch component of the graft copolymer and to contain a repeating unit derived from the macromonomer.
- the macromonomer is a polymer monomer having a terminal polymerizable functional group and a high molecular weight skeleton component.
- the glass transition temperature (Tg) of the macromonomer is preferably higher than the glass transition temperature of the copolymer component constituting the acrylic copolymer (A1). Specifically, since the glass transition temperature (Tg) of the macromonomer affects the heating and melting temperature (hot melt temperature) of the pressure-sensitive adhesive composition (I), the glass transition temperature (Tg) of the macromonomer is 30 ° C. to It is preferably 120 ° C., more preferably 40 ° C. or more and 110 ° C. or less, and particularly preferably 50 ° C. or more or 100 ° C. or less.
- the glass transition temperature of the macromonomer refers to the glass transition temperature of the macromonomer itself, and can be measured with a differential scanning calorimeter (DSC).
- the branch components are attracted to each other and can maintain a state where they are physically cross-linked as a pressure-sensitive adhesive composition, and the physical cross-linking is released by heating to an appropriate temperature.
- the macromonomer is preferably contained in the acrylic copolymer (A1) in a proportion of 5% by mass to 30% by mass, particularly 6% by mass or 25% by mass, and more preferably 8% by mass. It is preferable that the amount is 20% by mass or more.
- the number average molecular weight of the macromonomer is preferably 500 or more and less than 8000, more preferably 800 or more and less than 7500, and particularly preferably 1000 or more and less than 7000.
- a generally produced one for example, a macromonomer manufactured by Toa Gosei Co., Ltd.
- the high molecular weight skeleton component of the macromonomer is preferably composed of an acrylic polymer or a vinyl polymer.
- Examples of the high molecular weight skeleton component of the macromonomer include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, and isobutyl (meth) acrylate.
- Examples of the terminal polymerizable functional group of the macromonomer include a methacryloyl group, an acryloyl group, and a vinyl group.
- the acrylic copolymer (A1) preferably has a complex viscosity of 100 to 800 Pa ⁇ s, more preferably 150 to 700 Pa ⁇ s, more preferably 170 to 600 Pa ⁇ s at a temperature of 130 ° C. and a frequency of 0.02 Hz. preferable.
- the complex viscosity at a temperature of 130 ° C. of the acrylic copolymer (A1) affects the fluidity of the pressure-sensitive adhesive composition (I) when the transparent double-sided pressure-sensitive adhesive material is used by hot-melting. Is 100 to 800 Pa ⁇ s, excellent hot melt suitability can be obtained.
- the weight average molecular weight of the acrylic copolymer (A1) or the trunk component of the acrylic copolymer (A1) is configured.
- examples include adjusting the glass transition temperature of the copolymer component.
- the weight average molecular weight of the acrylic copolymer (A1) is preferably 50,000 to 500,000, preferably 120,000 or more and 450,000 or less, and more preferably 150,000 or more and 400,000 or less. More preferred.
- the glass transition temperature of the copolymer component constituting the backbone component of the acrylic copolymer (A1) is preferably ⁇ 70 ° C. to 0 ° C., more preferably ⁇ 65 ° C.
- Examples thereof include a method of adjusting viscoelasticity by adjusting the molecular weight of the copolymer component while adjusting the temperature to 60 ° C. or higher or ⁇ 10 ° C. or lower. However, it is not limited to this method.
- Crosslinking agent (B1)) for example, an epoxy crosslinking agent, an isocyanate crosslinking agent, an oxetane compound, a silane compound, an acrylic compound, or the like can be appropriately selected.
- polyfunctional (meth) acrylates having two or more (meth) acryloyl groups, particularly three or more, are preferred in terms of reactivity and the strength of the resulting cured product.
- the cross-linking agent (B1) is cross-linked in the adhesive material, so that the sheet exhibits high cohesive force in a high temperature environment instead of losing hot melt properties. Excellent foaming reliability can be obtained.
- polyfunctional (meth) acrylates examples include 1,4-butanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, glycerin di (meth) acrylate, glycerin glycidyl ether di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, bisphenol A polyethoxydi (meth) acrylate, bisphenol A polyalkoxydi (meth) ) Acrylate, bisphenol F polyalkoxydi (meth) acrylate, polyalkylene glycol di (meth) acrylate, trimethylolpropane trioxyethyl (meth) acrylate, ⁇ -caprolactone modified Lith (2-hydroxyethyl) isocyanurate
- a polyfunctional monomer or oligomer containing a polar functional group such as a hydroxyl group is preferable from the viewpoint of improving the adhesion to the adherend and the effect of suppressing the heat and whitening.
- polyfunctional (meth) acrylic acid ester having a hydroxyl group it is preferable to use polyfunctional (meth) acrylic acid ester having a hydroxyl group. Therefore, from the viewpoint of preventing wet heat whitening, it is preferable to contain a hydrophobic acrylate monomer and a hydrophilic acrylate monomer as a backbone component of the acrylic copolymer (A1), that is, the graft copolymer.
- a polyfunctional (meth) acrylic acid ester having a hydroxyl group as the crosslinking agent (B).
- the content of the crosslinking agent (B1) is not particularly limited.
- the ratio of 0.5 to 20 parts by weight, especially 1 part by weight or more and 15 parts by weight or less, especially 2 parts by weight or more or 10 parts by weight or less, relative to 100 parts by weight of the acrylic copolymer (A1). is preferred.
- the photopolymerization initiator (C1) serves as a reaction initiation assistant in the cross-linking reaction of the above-described cross-linking agent (B1), and those described in the photo-polymerization initiator (C) are appropriately used. Can be used.
- the content of the photopolymerization initiator (C1) is not particularly limited. As a guideline, 0.1 to 10 parts by weight, especially 0.5 parts by weight or more and 5 parts by weight or less, and 1 part by weight or more or 3 parts by weight or less based on 100 parts by weight of the acrylic copolymer (A1). It is preferable to contain in the ratio. By setting the content of the photopolymerization initiator (C1) in the above range, an appropriate reaction sensitivity with respect to the active energy ray can be obtained.
- the wavelength converting agent (D1) fulfills the function of promoting the photocuring reaction in places where it is difficult for light to reach, such as the printing concealment part, and the one described in the above-mentioned wavelength converting agent (D) should be used as appropriate. Can do.
- the content of the wavelength converting agent (D1) is not particularly limited, but is 0.001 to 2 parts by mass, especially 0.002 parts by mass or more with respect to 100 parts by mass of the acrylic copolymer (A1).
- the content is preferably 1.5 parts by mass or less, and more preferably 0.004 parts by mass or more or 1 part by mass or less.
- the pressure-sensitive adhesive composition (I) may contain known components blended in a normal pressure-sensitive adhesive composition as components other than those described above. For example, if necessary, tackifier resins, antioxidants, light stabilizers, UV absorbers, metal deactivators, rust inhibitors, anti-aging agents, hygroscopic agents, foaming agents, antifoaming agents, inorganic Various additives such as particles and viscosity modifiers can be contained as appropriate. Moreover, you may contain reaction catalyst (A tertiary amine type compound, a quaternary ammonium type compound, a lauric acid tin compound, etc.) suitably as needed.
- reaction catalyst A tertiary amine type compound, a quaternary ammonium type compound, a lauric acid tin compound, etc.
- a resin composition containing a base polymer (A2) containing a coalescence or vinyl copolymer, a crosslinking agent (B2), a photopolymerization initiator (C2), and a wavelength conversion agent (D2) can be mentioned. .
- the base polymer means a resin that forms the main component of the pressure-sensitive adhesive composition (II).
- the resin contained in the pressure-sensitive adhesive composition (II) is 50% by mass or more, particularly 80% by mass or more, and more preferably 90% by mass or more (100% by mass). (In the case where there are two or more types of base polymers, the total amount thereof corresponds to the content).
- the base polymer (A2) is preferably a (meth) acrylic acid ester copolymer or a vinyl copolymer.
- the above (meth) acrylic acid ester copolymer or vinyl copolymer preferably has a weight average molecular weight of 50,000 to 400,000 from the viewpoint of achieving both shape retention at room temperature and hot melt properties. It is more preferably 350,000 or less, more preferably 70000 or more or 300000 or less.
- Acrylic acid ester-based copolymers have physical properties such as glass transition temperature (Tg) and molecular weight by appropriately selecting the types, composition ratios, and polymerization conditions of acrylic monomers and methacrylic monomers used to adjust them. Can be adjusted as appropriate.
- examples of the acrylic monomer constituting the acrylic ester copolymer include 2-ethylhexyl acrylate, n-octyl acrylate, isooctyl acrylate, n-butyl acrylate, ethyl acrylate, and the like as main raw materials.
- a (meth) acrylic monomer having various functional groups may be copolymerized with the acrylic monomer according to the purpose of imparting cohesive force or imparting polarity.
- the (meth) acrylic monomer having a functional group include methyl methacrylate, methyl acrylate, hydroxyethyl acrylate, acrylic acid, glycidyl acrylate, N-substituted acrylamide, acrylonitrile, methacrylonitrile, fluorine-containing alkyl acrylate, and organosiloxy group An acrylate etc. can be mentioned.
- examples of the vinyl copolymer include vinyl copolymers obtained by appropriately polymerizing vinyl acetate copolymerizable with the above acrylic monomer and methacrylic monomer, and various vinyl monomers such as alkyl vinyl ether and hydroxyalkyl vinyl ether. .
- the glass transition temperatures (Tg) of the monomers a, b and c are the meanings of the glass transition temperatures (Tg) when a polymer is produced from the monomers (homopolymerization).
- the monomer a is preferably a (meth) acrylic acid ester monomer having an alkyl group structure having a side chain having 4 or more carbon atoms, for example.
- the side chain having 4 or more carbon atoms may be a straight chain or a branched carbon chain.
- the monomer a is a (meth) acrylic acid ester monomer having a linear alkyl group structure having 4 to 10 carbon atoms, or a branched alkyl group structure having 6 to 18 carbon atoms ( It is preferably a (meth) acrylic acid ester monomer.
- (meth) acrylic acid ester monomer having a linear alkyl group structure having 4 to 10 carbon atoms includes n-butyl (meth) acrylate, n-hexyl (meth) acrylate, and n-octyl (meth). Examples thereof include acrylate, n-nonyl (meth) acrylate, and n-decyl (meth) acrylate.
- (meth) acrylic acid ester monomer having a branched alkyl group structure having 6 to 18 carbon atoms includes 2-ethylhexyl (meth) acrylate, 2-methylhexyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (Meth) acrylate, isodecyl (meth) acrylate, isostearyl (meth) acrylate, etc. can be mentioned.
- the monomer b has a (meth) acrylic acid ester monomer having 4 or less carbon atoms, a (meth) acrylic acid ester monomer having a cyclic skeleton in the side chain, a vinyl monomer having 4 or less carbon atoms, or a cyclic skeleton in the side chain.
- a vinyl monomer is preferred.
- the monomer b is particularly preferably a vinyl monomer having 4 or less carbon atoms in the side chain.
- (meth) acrylic acid ester monomer having 4 or less carbon atoms methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl ( Examples thereof include meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) acrylate, and isobutyl (meth) acrylate.
- (meth) acrylic acid ester monomers having a cyclic skeleton in the side chain examples include isobornyl (meth) acrylate, cyclohexyl (meth) acrylate, 1,4-cyclohexanedimethanol mono (meth) acrylate, tetrahydrofurfuryl (meth) Acrylate, benzyl (meth) acrylate, phenoxyethyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, 3,3,5-trimethylcyclohexanol (meth) acrylate, cyclic trimethylolpropane formal (meta ) Acrylate, 4-ethoxylated cumylphenol (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate dicyclopentenyl (meth) acrylate, and the like.
- Examples of the “vinyl monomer having 4 or less carbon atoms” include vinyl acetate, vinyl propionate, vinyl butyrate, n-propyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether, isobutyl vinyl ether and the like.
- Examples of the “vinyl monomer having a cyclic skeleton in the side chain” include styrene, cyclohexyl vinyl ether, norbornyl vinyl ether, norbornenyl vinyl ether and the like. Among these, a vinyl monomer having 4 or less carbon atoms in the side chain or an acrylate monomer having 4 or less carbon atoms in the side chain is particularly suitable.
- the monomer c is preferably a (meth) acrylic acid ester monomer having a side chain having 1 or less carbon atoms, or a (meth) acrylic acid ester monomer having a cyclic skeleton in the side chain.
- examples of the “(meth) acrylic acid ester monomer having a side chain having 1 or less carbon atoms” include methyl methacrylate, acrylic acid, and methacrylic acid.
- Examples of the (meth) acrylate monomer having a cyclic skeleton in the side chain include isobornyl methacrylate, 3,3,5-trimethylcyclohexyl methacrylate, dicyclopentanyl acrylate, dicyclopentanyl methacrylate, And cyclopentenyl methacrylate.
- the molar ratio of the monomer a, the monomer b, and the monomer c in the (meth) acrylic acid ester copolymer or vinyl copolymer constituting the base polymer (A2) is b> It is preferable that a> c.
- Crosslinking agent (B2) When the crosslinking agent (B2) is crosslinked in the pressure-sensitive adhesive sheet, the pressure-sensitive adhesive sheet exhibits a high cohesive force in a high-temperature environment and can obtain excellent foaming reliability.
- crosslinking agent (B2) for example, a crosslinking agent comprising an epoxy crosslinking agent, an isocyanate crosslinking agent, an oxetane compound, a silane compound, an acrylic compound, or the like can be appropriately selected.
- a crosslinking agent comprising an epoxy crosslinking agent, an isocyanate crosslinking agent, an oxetane compound, a silane compound, an acrylic compound, or the like
- polyfunctional (meth) acrylates having two or more (meth) acryloyl groups, particularly three or more, are preferred in terms of reactivity and the strength of the resulting cured product.
- polyfunctional (meth) acrylates examples include 1,4-butanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, glycerin di (meth) acrylate, glycerin glycidyl ether di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, bisphenol A polyethoxydi (meth) acrylate, bisphenol A polyalkoxydi (meth) ) Acrylate, bisphenol F polyalkoxy di (meth) acrylate, polyalkylene glycol di (meth) acrylate, trimethylolpropane trioxyethyl (meth) acrylate, ⁇ -caprolactone modification Tris (2-hydroxyethyl) isocyanurate tri
- a polyfunctional monomer or oligomer containing a polar functional group is preferable from the viewpoint of improving adhesion to the adherend, heat resistance, and wet heat whitening suppression effect.
- polyfunctional (meth) acrylic acid ester having an isocyanuric ring skeleton is preferable to use.
- the content of the crosslinking agent (B2) is not particularly limited.
- the ratio is 0.5 to 20 parts by mass, particularly 1 to 15 parts by mass, especially 2 to 10 parts by mass with respect to 100 parts by mass of the base polymer (A2). Is preferred.
- the photopolymerization initiator (C2) serves as a reaction initiation assistant in the cross-linking reaction of the above-described cross-linking agent (B2), and those described in the photo-polymerization initiator (C) are appropriately used. Can be used.
- the content of the photopolymerization initiator (C2) is not particularly limited. As a standard, 0.1 to 10 parts by weight with respect to 100 parts by weight of the base polymer (A2), especially 0.5 parts by weight or more and 5 parts by weight or less, and more preferably 1 part by weight or more or 3 parts by weight or less. It is preferable to contain. By setting the content of the photopolymerization initiator (C2) in the above range, an appropriate reaction sensitivity with respect to active energy rays can be obtained.
- the wavelength conversion agent (D2) fulfills the function of accelerating the photocuring reaction in places where it is difficult for light to reach, such as a printing concealment part, and the one described in the above-mentioned wavelength conversion agent (D) should be used as appropriate. Can do.
- the content of the wavelength converting agent (D2) is not particularly limited, but is 0.001 to 2 parts by mass, particularly 0.002 parts by mass or more, or 1.5 to 100 parts by mass of the base polymer (A2). It is preferably contained in a proportion of not more than part by mass, and more preferably not less than 0.004 part by mass or not more than 1 part by mass.
- the pressure-sensitive adhesive composition (II) may contain known components blended in a normal pressure-sensitive adhesive composition as components other than those described above. For example, if necessary, tackifier resins, antioxidants, light stabilizers, UV absorbers, metal deactivators, rust inhibitors, anti-aging agents, hygroscopic agents, foaming agents, antifoaming agents, inorganic Various additives such as particles and viscosity modifiers can be contained as appropriate. Moreover, you may contain reaction catalyst (A tertiary amine type compound, a quaternary ammonium type compound, a lauric acid tin compound, etc.) suitably as needed.
- reaction catalyst A tertiary amine type compound, a quaternary ammonium type compound, a lauric acid tin compound, etc.
- a thin flat product having an extremely small thickness and an arbitrarily limited maximum thickness which is usually supplied in the form of a roll (Japanese Industrial Standard JIS K6900).
- a film having a thickness of 100 ⁇ m or more is sometimes referred to as a sheet
- a film having a thickness of less than 100 ⁇ m is sometimes referred to as a film.
- the boundary between the sheet and the film is not clear and it is not necessary to distinguish the two in terms of the present invention, in the present invention, even when the term “film” is used, the term “sheet” is included and the term “sheet” is used. In some cases, “film” is included.
- Example 1 As the acrylic copolymer (A), an acrylic ester copolymer obtained by random copolymerization of 15 parts by weight of a polymethyl methacrylate macromonomer having a number average molecular weight of 2400, 81 parts by weight of butyl acrylate, and 4 parts by weight of acrylic acid.
- A-1) weight average molecular weight 230,000
- A-1 acrylate copolymer
- B-1 acrylate copolymer
- B-1 acrylate copolymer
- B-1 acrylate copolymer
- B-1 acrylate copolymer
- B-1 acrylate copolymer
- B-1 acrylate copolymer
- B-1 glycerin dimethacrylate
- C-1 light Ezacure KTO46 (manufactured by Lanberti)
- C-1 polymerization initiator
- D 2,5-bis (5-tert-butyl-2-benzoxazolyl)
- D Thiophene
- TinopaOB manufactured by BASF
- a release-treated polyethylene terephthalate film (referred to as “release film 1”, “Diafoil MRV-V06”, thickness 100 ⁇ m) manufactured by Mitsubishi Plastics Co., Ltd., and a release-treated polyethylene terephthalate film (referred to as “release film 2”).
- the adhesive resin composition 1 is sandwiched between two release films 1 and 2 with “Diafoil MRQ” (75 ⁇ m in thickness) manufactured by the company and shaped into a sheet shape using a laminator to a thickness of 200 ⁇ m. Thus, the pressure-sensitive adhesive sheet 1 was produced.
- 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiophene (D-1) as the wavelength converting agent (D) is an organic phosphor, and is an acrylic copolymer. It has a property compatible with (A-1).
- the acrylic copolymer (A-1) is a kind of (meth) acrylic acid ester copolymer composed of a graft copolymer having a macromonomer as a branch component.
- the pressure-sensitive adhesive resin composition 1 has a hot-melt property that softens or flows when heated in an uncrosslinked state, and also has a photo-crosslinkability that crosslinks with light.
- Example 2 The mixing amount of 2,5-bis (5-t-butyl-2-benzoxazolyl) thiophene (TinopaOB, manufactured by BASF) (D-1) as the wavelength converting agent (D) was changed to 0.5 g. Except for the above, an adhesive resin composition 2 was produced in the same manner as in Example 1. And like Example 1, this adhesive resin composition 2 was pinched
- Example 3 Except that the mixing amount of 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiophene (TinopaOB, manufactured by BASF) (D-1) as the wavelength converting agent (D) was changed to 1 g.
- a pressure-sensitive adhesive resin composition 3 was produced. And like Example 1, this adhesive resin composition 3 was pinched
- Example 4 For 1 kg of the acrylic ester copolymer (A-1) used in Example 1, 100 g of trimethylolpropane epoxy acrylate (B-2) as a crosslinking agent (B) and a photopolymerization initiator (C) Ezacure KTO46 (manufactured by Lanberti) (C-1) 30 g and 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiophene (D-1) 0 as wavelength converting agent (D) .2 g was uniformly mixed to prepare an adhesive resin composition 4. And like Example 1, this adhesive resin composition 4 was pinched
- the pressure-sensitive adhesive resin composition 4 has a hot-melt property that softens or flows when heated in an uncrosslinked state, and also has a photo-crosslinkability that crosslinks with light.
- Example 5 In Example 4, instead of mixing 30 g of (C-1), 15 g of Ezacure TZT (manufactured by Lanberti) (C-2) as a photopolymerization initiator (C) was mixed and used as a photosensitizer. A pressure-sensitive adhesive resin composition 5 was produced in the same manner as in Example 4 except that 50 g of Ezacure A198 (manufactured by Lanberti) was mixed. And like Example 1, this adhesive resin composition 5 was pinched
- Example 6 In Example 1, instead of mixing 0.1 g of the wavelength converting agent (D-1), as the wavelength converting agent (D), 1 g of Packol PY1800 (manufactured by Showa Chemical Industry Co., Ltd.) (D-2) was mixed. Produced the adhesive resin composition 6 in the same manner as in Example 1. And like Example 1, this adhesive resin composition 6 was pinched
- the pressure-sensitive adhesive resin composition 6 has a hot-melt property that softens or flows when heated in an uncrosslinked state, and also has a photo-crosslinkability that crosslinks with light.
- Example 7 In Example 1, instead of mixing 0.1 g of the wavelength converting agent (D-1), 1 g of Packol PSR (manufactured by Showa Chemical Industry Co., Ltd.) (D-3) was mixed as the wavelength converting agent (D).
- D-3 1 g of
- the pressure-sensitive adhesive resin composition 7 has a hot-melt property that softens or flows when heated in an uncrosslinked state, and has a photo-crosslinkability that crosslinks with light.
- Example 8 As the vinyl copolymer (A), a vinyl copolymer (A-2) obtained by random copolymerization of 55 parts by weight of 2-ethylhexyl acrylate, 40 parts by weight of vinyl acetate, and 5 parts by weight of acrylic acid. (2,4,6-trioxo-1,3,5-triazinan) as a crosslinking agent (B) with respect to 1 kg of the vinyl copolymer (A-2).
- 1,3,5-triyl) triethylenetriacrylate (B-3) (Toa Gosei, Aronix M315) and Ezacure KTO46 (C-1) as a photopolymerization initiator (C) (manufactured by Lanberti) 15 g and 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiophene (TinopaOB, manufactured by BASF) (D-1) 0.2 g as a wavelength converting agent (D) are mixed uniformly.
- 2,5-bis (5-t-butyl-2-benzoxazolyl) thiophene (D-1) as the wavelength converting agent (D) is an organic phosphor and a vinyl copolymer. It has a property compatible with (A-2).
- the vinyl copolymer (A-2) comprises a monomer a having a glass transition temperature (Tg) of less than 0 ° C., a monomer b having a glass transition temperature (Tg) of from 0 ° C. to less than 80 ° C., and a glass transition temperature ( Tg) is a kind of vinyl copolymer obtained by copolymerization with a monomer c having a temperature of 80 ° C.
- the pressure-sensitive adhesive resin composition 8 has a hot-melt property that softens or flows when heated in an uncrosslinked state, and has a photo-crosslinkability that crosslinks with light.
- Example 9 instead of the release film 1, a polyethylene terephthalate film (Mitsubishi Resin “Diafoil O700E-100”, thickness 100 ⁇ m) coated with an ultraviolet absorber is used (referred to as “release film 3”).
- release film 3 a polyethylene terephthalate film coated with an ultraviolet absorber coated with an ultraviolet absorber coated with an ultraviolet absorber is used (referred to as “release film 3”).
- a pressure-sensitive adhesive sheet 9 was prepared in the same manner as in Example 2 except that.
- Example 1 except that 2,5-bis (5-t-butyl-2-benzoxazolyl) thiophene (TinopaOB, manufactured by BASF) (D-1) was not added as the wavelength converting agent (D). Similarly, the pressure-sensitive adhesive composition 10 was prepared. And like Example 1, this adhesive resin composition 9 was pinched
- a pressure-sensitive adhesive composition 12 was produced according to Example 3 of Japanese Patent No. 4971529. That is, an acrylic ester copolymer obtained by random copolymerization of 75 parts by mass of 2-ethylhexyl acrylate, 20 parts by mass of vinyl acetate and 5 parts by mass of acrylic acid, into 1 kg of the acrylic ester copolymer (A-3), 50 g of nonanediol diacrylate (V # 260, manufactured by Osaka Organic Chemical Co., Ltd.) (B-4) as a crosslinking agent (B) and 10 g of 4-methylbenzophenone (C-3) as a photopolymerization initiator (C) were mixed and added. Thus, an adhesive resin composition 12 was prepared.
- this adhesive resin composition 12 was pinched
- the pressure-sensitive adhesive composition is irradiated with ultraviolet rays from the light-shielding sheet side of the laminate thus prepared using a high-pressure mercury lamp so that the integrated light quantity at a wavelength of 365 nm is 2000 mJ / cm 2.
- the object was cured. About the location where light was shielded, the portion from the long side end face of the light shielding sheet to 1 mm was cut with a cutter, and only the pressure-sensitive adhesive composition was taken out, and the gel fraction was measured using the following method. The gel fraction was calculated
- the adhesive composition 13 of the comparative example 4 After apply
- This glass substrate for evaluation is a substitute for an image display device constituent member having a concealing portion with a stepped portion on the bonding surface.
- One release film 2 of the pressure-sensitive adhesive sheet prepared in Examples 1 to 8 and Comparative Examples 1 to 3 is peeled off on the printing surface of the glass substrate, and a 1 kg roll is reciprocated twice to cover the printing step at the periphery.
- the adhesive sheet was pasted.
- the remaining release film 1 is peeled off, and a cycloolefin polymer film (thickness: 100 ⁇ m) is press bonded at 80 ° C. under a reduced pressure (absolute pressure 5 kPa) at a pressing pressure of 0.02 MPa on the exposed adhesive surface, followed by autoclave treatment. (60 ° C., 0.2 MPa, 20 minutes) was applied and finished.
- the resin composition 12 was directly applied to a glass substrate so as to have a thickness of 150 ⁇ m, and then a cycloolefin polymer film (thickness 100 ⁇ m) was coated.
- the laminate was irradiated with ultraviolet rays from the glass substrate side using a high-pressure mercury lamp so that light having a wavelength of 365 nm reached the pressure-sensitive adhesive composition at 2000 mJ / cm 2 .
- the prepared laminate was visually observed, and the film was bent in the vicinity of the step and the unevenness due to distortion was seen as “x”, and the film smoothly bonded without bubbles was judged as “ ⁇ ”.
- Total light transmittance, haze About the laminated body created by level
- the spectral transmittance (T%) at a wavelength of 300 nm to 500 nm was measured using a spectrophotometer (UV2000, manufactured by Shimadzu Corporation). From the transmittance at a wavelength of 390 nm, the absorbance X of the pressure-sensitive adhesive sheet was calculated from the following formula, and the pressure-sensitive adhesive sheet thickness Y (mm) was divided to obtain X / Y.
- X -Log (T / 100)
- the spectral transmittance (T%) at a wavelength of 300 nm to 500 nm was measured using a spectrophotometer (manufactured by Shimadzu Corporation, UV2000). Further, for the pressure-sensitive adhesive sheets 2 and 9 produced in Examples 2 and 9, the pressure-sensitive adhesive sheet 2 was placed flat with the release film 1 facing up, and the pressure-sensitive adhesive sheet 9 was placed flat with the release film 3 facing up, and a fluorescent lamp The product was stored for 1 day at the bottom (environmental illumination 1170 lux). And the gel fraction of the adhesive sheets 2 and 9 after 1-day storage was computed according to the above-mentioned gel fraction measuring method. The measurement results are shown in Table 2.
- the pressure-sensitive adhesive composition of the example not only has excellent step following ability, but also the wavelength conversion agent contributes to the acceleration of curing of the concealed portion, so that the curing of the lower part of the printing also proceeds and stored. It was found to be excellent in stability.
- Comparative Example 1 did not contain a wavelength conversion agent, the pressure-sensitive adhesive composition at the printing step portion partially flowed, and the storage stability at high temperature was not sufficient.
- Comparative Example 2 the light necessary for photocrosslinking did not reach the deep part of the polymerization composition because of the high absorbance by the wavelength converting agent, and the photocuring reaction did not proceed sufficiently even at the directly exposed locations.
- the comparative example 3 did not contain the wavelength conversion agent, it was subjected to primary cross-linking before being bonded to the member. Therefore, although excellent storage stability was obtained, the film was bent in the vicinity of the step at the time of bonding. However, the step absorbability was not sufficiently obtained.
- Comparative Example 4 is a liquid pressure-sensitive adhesive composition, which is excellent in step absorbability because it flows arbitrarily, but the resin sticks out in places that are difficult to cure such as under printing, and the storage stability is insufficient. there were. Moreover, since an acrylic copolymer was not included, the cured product had no tackiness and was inferior in adhesion to an adherend. In addition, about the gel fraction value of the concealment part in the comparative example 4, since a part remained in a liquid state, it was not possible to collect all the resin composition from the adherend, and an accurate gel fraction value was obtained. Cann't get.
- Example 9 by setting it as the structure provided with the peeling film whose light transmittance of the light shorter than the wavelength of 380 nm is 40% or less, the progress of gelation in the pressure-sensitive adhesive sheet before use is suppressed.
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Abstract
The present invention relates to a photocurable adhesive sheet. Provided is a new adhesive sheet that can be photocured even if there are places such as print-concealed sections that are difficult for light to reach, and even if the adhesive sheet has a certain degree of thickness, the entire sheet can be photocured. Proposed is a transparent adhesive sheet formed from an adhesive composition containing: (A) a thermoplastic resin; (B) a crosslinking agent; (C) a photopolymerization initiator that reacts with light having a wavelength of at least 380-430 nm; and (D) a wavelength conversion agent that is excited by light having a wavelength shorter than 380 nm and that emits light having a wavelength of 380-550 nm. The transparent adhesive sheet is characterized by the adhesive sheet absorbance X at a wavelength of 390 nm and the adhesive sheet thickness Y satisfying relational expression (1). Expression (1): 0.5≤X/Y≤12
Description
本発明は、画像表示装置構成用部材を貼り合わせるのに好適な、光硬化可能な透明粘着シートに関する。
The present invention relates to a photocurable curable transparent adhesive sheet suitable for bonding image display device constituent members.
近年、画像表示装置の視認性を向上させるために、液晶ディスプレイ（ＬＣＤ）、プラズマディスプレイ（ＰＤＰ）、エレクトロルミネッセンスディスプレイ（ＥＬＤ）等の画像表示パネルと、その前面側（視認側）に配置する保護パネルやタッチパネル部材との間の空隙を接着剤で充填することにより、入射光や表示画像からの出射光の空気層界面での反射を抑えることが行われている。
In recent years, in order to improve the visibility of an image display device, an image display panel such as a liquid crystal display (LCD), a plasma display (PDP), an electroluminescence display (ELD), and a protection disposed on the front side (viewing side). By filling the gap between the panel and the touch panel member with an adhesive, reflection of incident light and outgoing light from the display image at the air layer interface is suppressed.
このような画像表示装置用構成部材間の空隙を粘着剤で充填する方法として、紫外線硬化性樹脂を含む液状の接着樹脂組成物を該空隙に充填した後、紫外線を照射して硬化せしめる方法が知られている（特許文献１）。
As a method for filling the gap between the constituent members for an image display device with an adhesive, there is a method in which a liquid adhesive resin composition containing an ultraviolet curable resin is filled into the gap and then cured by irradiation with ultraviolet rays. Known (Patent Document 1).
また、画像表示装置用構成部材間の空隙を、粘着シートを用いて充填する方法も知られている。例えば特許文献２には、紫外線によって１次架橋した粘着シートを画像表示装置構成部材に貼合後、画像表示装置構成部材を介して粘着シートに紫外線照射し２次硬化させる方法が開示されている。
Also known is a method of filling a gap between component members for an image display device using an adhesive sheet. For example, Patent Document 2 discloses a method in which a pressure-sensitive adhesive sheet that has undergone primary crosslinking with ultraviolet rays is bonded to an image display device constituent member, and then the adhesive sheet is irradiated with ultraviolet rays through the image display device constituent member to be secondarily cured. .
特許文献３には、重量平均分子量が２万から１０万であるウレタン（メタ）アクリレートを主成分とした、２５℃における損失正接が１未満であるホットメルトタイプの接着組成物からなる粘着シートを用いて、画像表示装置用構成部材間の空隙を充填する方法が開示されている。
Patent Document 3 discloses a pressure-sensitive adhesive sheet comprising a hot-melt adhesive composition having a loss tangent at 25 ° C. of less than 1 based on urethane (meth) acrylate having a weight average molecular weight of 20,000 to 100,000. And a method for filling a gap between constituent members for an image display device.
ところで、携帯電話や携帯端末などの画像表示装置においては、表面保護パネルの周縁部に、枠状に隠蔽部を印刷するのが一般的である。前述のように、光硬化性の粘着剤や粘着シートを用いて画像表示装置構成部材を接着する場合、このような隠蔽部が存在すると、粘着剤を硬化させるために照射する紫外線が到達し難い箇所が生じるため、その部分を硬化させることができず、安定した品質を得ることが難しいという問題があった。
そこで、例えば特許文献４（特開２０１３－１８４９９７号公報）は、陰影部や狭隙部等でも、良好に硬化させることができる液状光硬化性樹脂組成物として、エチレン性不飽和結合含有成分と、３７０～４２０ｎｍの範囲内に極大吸収波長を有する光重合開始剤と、蛍光体とを含む液状光硬化性樹脂組成物を開示している。 By the way, in an image display device such as a mobile phone or a mobile terminal, it is common to print a concealing portion in a frame shape on the peripheral portion of the surface protection panel. As described above, when an image display device constituent member is bonded using a photocurable adhesive or pressure sensitive adhesive sheet, if such a concealing portion is present, it is difficult for ultraviolet rays to be irradiated to cure the adhesive. Since a part is generated, the part cannot be cured, and there is a problem that it is difficult to obtain a stable quality.
Thus, for example, Patent Document 4 (Japanese Patent Application Laid-Open No. 2013-184997) discloses an ethylenically unsaturated bond-containing component as a liquid photocurable resin composition that can be cured well even in shadows, narrow gaps, and the like. A liquid photocurable resin composition containing a photopolymerization initiator having a maximum absorption wavelength in the range of 370 to 420 nm and a phosphor is disclosed.
そこで、例えば特許文献４（特開２０１３－１８４９９７号公報）は、陰影部や狭隙部等でも、良好に硬化させることができる液状光硬化性樹脂組成物として、エチレン性不飽和結合含有成分と、３７０～４２０ｎｍの範囲内に極大吸収波長を有する光重合開始剤と、蛍光体とを含む液状光硬化性樹脂組成物を開示している。 By the way, in an image display device such as a mobile phone or a mobile terminal, it is common to print a concealing portion in a frame shape on the peripheral portion of the surface protection panel. As described above, when an image display device constituent member is bonded using a photocurable adhesive or pressure sensitive adhesive sheet, if such a concealing portion is present, it is difficult for ultraviolet rays to be irradiated to cure the adhesive. Since a part is generated, the part cannot be cured, and there is a problem that it is difficult to obtain a stable quality.
Thus, for example, Patent Document 4 (Japanese Patent Application Laid-Open No. 2013-184997) discloses an ethylenically unsaturated bond-containing component as a liquid photocurable resin composition that can be cured well even in shadows, narrow gaps, and the like. A liquid photocurable resin composition containing a photopolymerization initiator having a maximum absorption wavelength in the range of 370 to 420 nm and a phosphor is disclosed.
前記特許文献４のように、液状の紫外線硬化型接着剤を用いて画像表示装置構成部材を接着すると、液を塗布や充填する際に厚みムラが生じやすく、調整や条件出しに係る作業が煩雑となるため、生産性が劣るという問題を抱えていた。また、蛍光体を配合すると、接着剤樹脂組成物の透明性が低下するため、接着剤が厚くなりすぎると接着剤の深部にまで光が届かなくなり、かえって硬化性が低下する場合があるという課題を抱えていた。さらに、厚くなりすぎた箇所や陰影部などで接着剤の硬化不足が生じた場合、粘着剤が漏れ出したり、接触する部材を浸食したりする等、深刻な不具合を生じ易いという問題も抱えていた。
When the image display device constituent members are bonded using a liquid ultraviolet curable adhesive as in Patent Document 4, thickness unevenness is likely to occur when the liquid is applied or filled, and the work related to adjustment and condition setting is complicated. As a result, productivity was inferior. In addition, when the phosphor is blended, the transparency of the adhesive resin composition is lowered. Therefore, if the adhesive becomes too thick, light cannot reach the deep part of the adhesive, and the curability may be lowered instead. Was holding. In addition, if the adhesive is insufficiently cured at a location that is too thick or shaded, the adhesive may leak, or the contacted member may be eroded, causing serious problems. It was.
他方、常態においてシート状を呈する粘着シートを、画像表示装置構成部材の接着に用いる場合には、たとえ未硬化状態であっても粘着剤が漏れ出すような深刻な不具合を生じることはない。しかしながら、隠蔽部を形成する印刷段差などに柔軟に追従して隅々まで入り込ませ、粘着シート内に生じる歪みを緩和させる観点から、粘着シートには柔軟性や流動性が求められている。
On the other hand, when the pressure-sensitive adhesive sheet that normally takes the form of a sheet is used for bonding the image display device constituent members, there is no serious problem that the pressure-sensitive adhesive leaks out even in an uncured state. However, the pressure-sensitive adhesive sheet is required to have flexibility and fluidity from the viewpoint of flexibly following a printing step forming the concealing portion and entering into every corner to alleviate distortion generated in the pressure-sensitive adhesive sheet.
そこで本発明は、常態においてシート状を呈する光硬化性の粘着シートに関し、印刷隠蔽部など光が届き難い箇所があっても光硬化させることができ、しかも、ある程度の厚さを有する粘着シートであってもシート全体を硬化させることができる、新たな粘着シートを提供せんとするものである。
Therefore, the present invention relates to a photocurable pressure-sensitive adhesive sheet that normally has a sheet shape, and can be photocured even if there is a place where light is difficult to reach, such as a print concealment portion, and is a pressure-sensitive adhesive sheet having a certain thickness. Even if it exists, it intends to provide the new adhesive sheet which can harden the whole sheet | seat.
本発明は、熱可塑性樹脂（Ａ）、架橋剤（Ｂ）、少なくとも波長３８０ｎｍ～４３０ｎｍの光で反応する光重合開始剤（Ｃ）、及び、波長３８０ｎｍより短波長側の光で励起され、波長３８０ｎｍ～５５０ｎｍの光を発光する波長変換剤（Ｄ）を含有する粘着剤組成物からなる透明粘着シートであって、波長３９０ｎｍにおける粘着シートの吸光度Ｘと、粘着シートの厚みＹとが次の関係式（１）を満足することを特徴とする透明粘着シートを提案する。
式（１）・・・０．５≦Ｘ／Ｙ≦１２ The present invention is excited by a thermoplastic resin (A), a crosslinking agent (B), a photopolymerization initiator (C) that reacts with light having a wavelength of at least 380 nm to 430 nm, and light having a wavelength shorter than 380 nm. A transparent pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive composition containing a wavelength conversion agent (D) that emits light of 380 nm to 550 nm, wherein the absorbance X of the pressure-sensitive adhesive sheet at a wavelength of 390 nm and the thickness Y of the pressure-sensitive adhesive sheet have the following relationship The transparent adhesive sheet characterized by satisfying Formula (1) is proposed.
Formula (1) ... 0.5 <= X / Y <= 12
式（１）・・・０．５≦Ｘ／Ｙ≦１２ The present invention is excited by a thermoplastic resin (A), a crosslinking agent (B), a photopolymerization initiator (C) that reacts with light having a wavelength of at least 380 nm to 430 nm, and light having a wavelength shorter than 380 nm. A transparent pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive composition containing a wavelength conversion agent (D) that emits light of 380 nm to 550 nm, wherein the absorbance X of the pressure-sensitive adhesive sheet at a wavelength of 390 nm and the thickness Y of the pressure-sensitive adhesive sheet have the following relationship The transparent adhesive sheet characterized by satisfying Formula (1) is proposed.
Formula (1) ... 0.5 <= X / Y <= 12
本発明が提案する透明粘着シートは、波長３８０ｎｍより短波長側の光、すなわち例えば“紫外線”を照射すると、波長変換剤（Ｄ）が励起されて、波長３８０ｎｍ～５５０ｎｍの光、すなわち例えば“可視光”を発光する。このように粘着シート内部において波長変換剤（Ｄ）が可視光を発光することにより、印刷隠蔽部など前記紫外線が届き難い箇所があっても前記の可視光が届くため、光重合開始剤（Ｃ）によって光架橋して硬化させることができる。
さらに、粘着シートの吸光度Ｘと厚みＹが上記関係式（１）を満足するように調整することにより、ある程度の厚さを有する粘着シートであっても、粘着シートの深部にまで光が届き、且つ、印刷隠蔽部など前記紫外線が届き難い箇所にも前記可視光が届くため、シート全体を硬化させることができる。 When the transparent adhesive sheet proposed by the present invention is irradiated with light having a wavelength shorter than 380 nm, for example, “ultraviolet rays”, the wavelength converting agent (D) is excited, and light having a wavelength of 380 nm to 550 nm, for example, “visible” Emits light. In this way, the wavelength conversion agent (D) emits visible light inside the pressure-sensitive adhesive sheet, so that the visible light reaches even if there is a place where the ultraviolet rays are difficult to reach, such as a print concealment part. ) Can be photocrosslinked and cured.
Further, by adjusting the absorbance X and thickness Y of the pressure-sensitive adhesive sheet to satisfy the above relational expression (1), even if the pressure-sensitive adhesive sheet has a certain thickness, light reaches the deep part of the pressure-sensitive adhesive sheet, And since the said visible light reaches also the places which the said ultraviolet rays cannot reach easily, such as a printing concealment part, the whole sheet | seat can be hardened.
さらに、粘着シートの吸光度Ｘと厚みＹが上記関係式（１）を満足するように調整することにより、ある程度の厚さを有する粘着シートであっても、粘着シートの深部にまで光が届き、且つ、印刷隠蔽部など前記紫外線が届き難い箇所にも前記可視光が届くため、シート全体を硬化させることができる。 When the transparent adhesive sheet proposed by the present invention is irradiated with light having a wavelength shorter than 380 nm, for example, “ultraviolet rays”, the wavelength converting agent (D) is excited, and light having a wavelength of 380 nm to 550 nm, for example, “visible” Emits light. In this way, the wavelength conversion agent (D) emits visible light inside the pressure-sensitive adhesive sheet, so that the visible light reaches even if there is a place where the ultraviolet rays are difficult to reach, such as a print concealment part. ) Can be photocrosslinked and cured.
Further, by adjusting the absorbance X and thickness Y of the pressure-sensitive adhesive sheet to satisfy the above relational expression (1), even if the pressure-sensitive adhesive sheet has a certain thickness, light reaches the deep part of the pressure-sensitive adhesive sheet, And since the said visible light reaches also the places which the said ultraviolet rays cannot reach easily, such as a printing concealment part, the whole sheet | seat can be hardened.
次に、本発明の実施形態の一例について説明する。但し、本発明が下記実施形態に限定されるものではない。
Next, an example of an embodiment of the present invention will be described. However, the present invention is not limited to the following embodiment.
＜本粘着シート＞
本発明の実施形態の一例に係る透明粘着シート（以下、「本粘着シート」と称する。）は、熱可塑性樹脂（Ａ）、架橋剤（Ｂ）、少なくとも波長３８０ｎｍ～４３０ｎｍの光で反応する光重合開始剤（Ｃ）、及び、波長３８０ｎｍより短波長側の光で励起され、波長３８０ｎｍ～５５０ｎｍの光を発光する波長変換剤（Ｄ）を含有する粘着剤組成物（「本粘着剤組成物」と称する）からなる透明粘着シートである。 <This adhesive sheet>
The transparent pressure-sensitive adhesive sheet according to an example of the embodiment of the present invention (hereinafter referred to as “the pressure-sensitive adhesive sheet”) includes a thermoplastic resin (A), a crosslinking agent (B), and light that reacts with light having a wavelength of at least 380 nm to 430 nm. A pressure-sensitive adhesive composition ("this pressure-sensitive adhesive composition") containing a polymerization initiator (C) and a wavelength conversion agent (D) that is excited by light having a wavelength shorter than 380 nm and emits light having a wavelength of 380 nm to 550 nm It is a transparent pressure-sensitive adhesive sheet.
本発明の実施形態の一例に係る透明粘着シート（以下、「本粘着シート」と称する。）は、熱可塑性樹脂（Ａ）、架橋剤（Ｂ）、少なくとも波長３８０ｎｍ～４３０ｎｍの光で反応する光重合開始剤（Ｃ）、及び、波長３８０ｎｍより短波長側の光で励起され、波長３８０ｎｍ～５５０ｎｍの光を発光する波長変換剤（Ｄ）を含有する粘着剤組成物（「本粘着剤組成物」と称する）からなる透明粘着シートである。 <This adhesive sheet>
The transparent pressure-sensitive adhesive sheet according to an example of the embodiment of the present invention (hereinafter referred to as “the pressure-sensitive adhesive sheet”) includes a thermoplastic resin (A), a crosslinking agent (B), and light that reacts with light having a wavelength of at least 380 nm to 430 nm. A pressure-sensitive adhesive composition ("this pressure-sensitive adhesive composition") containing a polymerization initiator (C) and a wavelength conversion agent (D) that is excited by light having a wavelength shorter than 380 nm and emits light having a wavelength of 380 nm to 550 nm It is a transparent pressure-sensitive adhesive sheet.
本粘着シートは、常態ではシート状を保持することができ、未架橋状態において加熱すると溶融乃至流動するホットメルト性を有しており、且つ、光架橋することができる光架橋性を有する粘着シートであるのが好ましい。
常態においてシート状を保持することができれば、液状の接着剤に比べて、取扱いが容易である上、液を充填する作業を省くことができるから、生産性に特に優れている。
さらに、常態、すなわち室温付近において、適度な接着性、例えば、剥離可能な程度の接着性（“タック性”と称する）を備えていれば、貼着する際の位置決めを行いやすく、作業上とても便利であるから、さらに好ましい。
また、加熱すると、溶融乃至流動するホットメルト性を備えていれば、加熱して軟化乃至流動化させることにより、印刷段差などの凹凸部に追随して粘着剤を充填することができるから、発泡などを生じることなく充填することができる。
さらに光架橋性を有していれば、最終的に光架橋させることで、しっかりと接着することができる。 This pressure-sensitive adhesive sheet can maintain a sheet shape in a normal state, has a hot melt property that melts or flows when heated in an uncrosslinked state, and has a photocrosslinkable property that can be photocrosslinked. Is preferred.
If the sheet shape can be maintained in a normal state, it is easy to handle as compared with the liquid adhesive, and the work of filling the liquid can be omitted, so that the productivity is particularly excellent.
In addition, if it has a proper adhesiveness, for example, a peelable adhesiveness (referred to as “tackiness”) in the normal state, that is, near room temperature, positioning at the time of sticking is easy to perform, and it is very difficult to work. It is more preferable because it is convenient.
Also, if it has a hot melt property that melts or flows when heated, it can be softened or fluidized by heating so that it can be filled with the adhesive following the uneven portions such as a printing step. It can be filled without causing such as.
Furthermore, if it has photocrosslinking property, it can adhere | attach firmly by carrying out photocrosslinking finally.
常態においてシート状を保持することができれば、液状の接着剤に比べて、取扱いが容易である上、液を充填する作業を省くことができるから、生産性に特に優れている。
さらに、常態、すなわち室温付近において、適度な接着性、例えば、剥離可能な程度の接着性（“タック性”と称する）を備えていれば、貼着する際の位置決めを行いやすく、作業上とても便利であるから、さらに好ましい。
また、加熱すると、溶融乃至流動するホットメルト性を備えていれば、加熱して軟化乃至流動化させることにより、印刷段差などの凹凸部に追随して粘着剤を充填することができるから、発泡などを生じることなく充填することができる。
さらに光架橋性を有していれば、最終的に光架橋させることで、しっかりと接着することができる。 This pressure-sensitive adhesive sheet can maintain a sheet shape in a normal state, has a hot melt property that melts or flows when heated in an uncrosslinked state, and has a photocrosslinkable property that can be photocrosslinked. Is preferred.
If the sheet shape can be maintained in a normal state, it is easy to handle as compared with the liquid adhesive, and the work of filling the liquid can be omitted, so that the productivity is particularly excellent.
In addition, if it has a proper adhesiveness, for example, a peelable adhesiveness (referred to as “tackiness”) in the normal state, that is, near room temperature, positioning at the time of sticking is easy to perform, and it is very difficult to work. It is more preferable because it is convenient.
Also, if it has a hot melt property that melts or flows when heated, it can be softened or fluidized by heating so that it can be filled with the adhesive following the uneven portions such as a printing step. It can be filled without causing such as.
Furthermore, if it has photocrosslinking property, it can adhere | attach firmly by carrying out photocrosslinking finally.
本粘着シートは、６０℃～１００℃に加熱すると軟化乃至流動化するホットメルト性を有するものであるのが特に好ましい。
このようなホットメルト性を有していれば、常態では、形状を保持することができるから、常態における貼合前の状態では、保管安定性や裁断などの取り回しに係るハンドリング性に優れたものとなる。
また、１００℃より高温に加熱しないと軟化しないようでは、１００℃を超える加熱によって画像表示装置構成用部材が損傷する可能性があるから、画像表示装置構成用部材の熱損傷を防ぐこともできる。
よって、このような観点から、本粘着シートは、６０～１００℃に加熱すると軟化乃至流動化するホットメルト性を有するのが好ましく、中でも６３℃以上或いは９８℃以下、その中でも特に６５℃以上或いは９５℃以下に加熱すると軟化乃至流動化するホットメルト性を有するのが特に好ましい。 It is particularly preferable that the pressure-sensitive adhesive sheet has a hot melt property that softens or fluidizes when heated to 60 ° C. to 100 ° C.
As long as it has such hot-melt properties, the shape can be maintained in the normal state, so that in the state before bonding in the normal state, it has excellent storage stability and handling properties related to handling such as cutting. It becomes.
Further, if it is not softened unless heated to a temperature higher than 100 ° C., the image display device constituting member may be damaged by heating above 100 ° C. Therefore, the image display device constituting member can be prevented from being thermally damaged. .
Therefore, from this point of view, the pressure-sensitive adhesive sheet preferably has a hot-melt property that softens or fluidizes when heated to 60 to 100 ° C., particularly 63 ° C. or higher and 98 ° C. or lower, especially 65 ° C. or higher or higher. It is particularly preferable to have a hot melt property that softens or fluidizes when heated to 95 ° C. or lower.
このようなホットメルト性を有していれば、常態では、形状を保持することができるから、常態における貼合前の状態では、保管安定性や裁断などの取り回しに係るハンドリング性に優れたものとなる。
また、１００℃より高温に加熱しないと軟化しないようでは、１００℃を超える加熱によって画像表示装置構成用部材が損傷する可能性があるから、画像表示装置構成用部材の熱損傷を防ぐこともできる。
よって、このような観点から、本粘着シートは、６０～１００℃に加熱すると軟化乃至流動化するホットメルト性を有するのが好ましく、中でも６３℃以上或いは９８℃以下、その中でも特に６５℃以上或いは９５℃以下に加熱すると軟化乃至流動化するホットメルト性を有するのが特に好ましい。 It is particularly preferable that the pressure-sensitive adhesive sheet has a hot melt property that softens or fluidizes when heated to 60 ° C. to 100 ° C.
As long as it has such hot-melt properties, the shape can be maintained in the normal state, so that in the state before bonding in the normal state, it has excellent storage stability and handling properties related to handling such as cutting. It becomes.
Further, if it is not softened unless heated to a temperature higher than 100 ° C., the image display device constituting member may be damaged by heating above 100 ° C. Therefore, the image display device constituting member can be prevented from being thermally damaged. .
Therefore, from this point of view, the pressure-sensitive adhesive sheet preferably has a hot-melt property that softens or fluidizes when heated to 60 to 100 ° C., particularly 63 ° C. or higher and 98 ° C. or lower, especially 65 ° C. or higher or higher. It is particularly preferable to have a hot melt property that softens or fluidizes when heated to 95 ° C. or lower.
本粘着シートは、単層でも多層でもよい。
本粘着シートが多層の場合には、全体として、上記性質、すなわち、常態ではシート状を保持することができ、未架橋状態において加熱すると溶融乃至流動するホットメルト性を有しており、且つ、光架橋することができる光架橋性を有する粘着シートであるのが好ましい。 The pressure-sensitive adhesive sheet may be a single layer or a multilayer.
When the pressure-sensitive adhesive sheet is a multilayer, as a whole, the above properties, that is, a sheet shape can be maintained in a normal state, and it has a hot melt property that melts or flows when heated in an uncrosslinked state, and A pressure-sensitive adhesive sheet that can be photocrosslinked is preferable.
本粘着シートが多層の場合には、全体として、上記性質、すなわち、常態ではシート状を保持することができ、未架橋状態において加熱すると溶融乃至流動するホットメルト性を有しており、且つ、光架橋することができる光架橋性を有する粘着シートであるのが好ましい。 The pressure-sensitive adhesive sheet may be a single layer or a multilayer.
When the pressure-sensitive adhesive sheet is a multilayer, as a whole, the above properties, that is, a sheet shape can be maintained in a normal state, and it has a hot melt property that melts or flows when heated in an uncrosslinked state, and A pressure-sensitive adhesive sheet that can be photocrosslinked is preferable.
本粘着シートの厚さは、５０μｍ～１ｍｍであるのが好ましく、中でも７５μｍ以上或いは５００μｍ以下であるのがより一層好ましい。
本粘着シートの厚さが５０μｍ以上であれば、高印刷段差等の凹凸部へ追従することができる点で好ましい。他方、シート厚さが１ｍｍ以下であれば、光学装置等の薄肉化の要求にこたえることができる。 The thickness of the present pressure-sensitive adhesive sheet is preferably 50 μm to 1 mm, and more preferably 75 μm or more or 500 μm or less.
If the thickness of this adhesive sheet is 50 micrometers or more, it is preferable at the point which can follow uneven | corrugated | grooved parts, such as a high printing level | step difference. On the other hand, if the sheet thickness is 1 mm or less, it is possible to meet the demand for thinning the optical device or the like.
本粘着シートの厚さが５０μｍ以上であれば、高印刷段差等の凹凸部へ追従することができる点で好ましい。他方、シート厚さが１ｍｍ以下であれば、光学装置等の薄肉化の要求にこたえることができる。 The thickness of the present pressure-sensitive adhesive sheet is preferably 50 μm to 1 mm, and more preferably 75 μm or more or 500 μm or less.
If the thickness of this adhesive sheet is 50 micrometers or more, it is preferable at the point which can follow uneven | corrugated | grooved parts, such as a high printing level | step difference. On the other hand, if the sheet thickness is 1 mm or less, it is possible to meet the demand for thinning the optical device or the like.
さらに、従来の画像表示装置における周縁の隠蔽層の印刷高さがより高く、具体的には８０μｍ程度の段差までをも埋める観点から、本粘着シートの厚さは７５μｍ以上がより好ましく、特に１００μｍ以上であるのがさらに好ましい。他方、薄肉化の要求にこたえる観点からは、５００μｍ以下であるのが好ましく、特に３５０μｍ以下であるのがさらに好ましい。
Furthermore, the thickness of the pressure-sensitive adhesive sheet is more preferably 75 μm or more, particularly 100 μm from the viewpoint of higher printing height of the peripheral concealing layer in the conventional image display device, specifically filling a step of about 80 μm. The above is more preferable. On the other hand, from the viewpoint of meeting the demand for thinning, it is preferably 500 μm or less, more preferably 350 μm or less.
本粘着シートは、架橋前の状態で、次の（１）及び（２）を満たすことが好ましい。
（１）架橋前の前記透明粘着材からなる厚さ１５０μｍのシートについて、ＪＩＳ－Ｚ－０２３７に準じて行う保持力測定において、ＳＵＳ板に対する温度４０℃でのズレ長さが５ｍｍ未満。
（２）架橋前の前記透明粘着材からなる厚さ１５０μｍのシートについて、ＪＩＳ－Ｚ－０２３７に準じて行う保持力測定において、ＳＵＳ板に対する温度８０℃でのズレ長さが１０ｍｍ以上。 The pressure-sensitive adhesive sheet preferably satisfies the following (1) and (2) in a state before crosslinking.
(1) With respect to a sheet having a thickness of 150 μm made of the transparent adhesive material before crosslinking, the displacement length at a temperature of 40 ° C. with respect to the SUS plate is less than 5 mm in the holding power measurement performed according to JIS-Z-0237.
(2) For a sheet having a thickness of 150 μm made of the transparent adhesive material before cross-linking, the displacement length at a temperature of 80 ° C. with respect to the SUS plate is 10 mm or more in the holding force measurement performed according to JIS-Z-0237.
（１）架橋前の前記透明粘着材からなる厚さ１５０μｍのシートについて、ＪＩＳ－Ｚ－０２３７に準じて行う保持力測定において、ＳＵＳ板に対する温度４０℃でのズレ長さが５ｍｍ未満。
（２）架橋前の前記透明粘着材からなる厚さ１５０μｍのシートについて、ＪＩＳ－Ｚ－０２３７に準じて行う保持力測定において、ＳＵＳ板に対する温度８０℃でのズレ長さが１０ｍｍ以上。 The pressure-sensitive adhesive sheet preferably satisfies the following (1) and (2) in a state before crosslinking.
(1) With respect to a sheet having a thickness of 150 μm made of the transparent adhesive material before crosslinking, the displacement length at a temperature of 40 ° C. with respect to the SUS plate is less than 5 mm in the holding power measurement performed according to JIS-Z-0237.
(2) For a sheet having a thickness of 150 μm made of the transparent adhesive material before cross-linking, the displacement length at a temperature of 80 ° C. with respect to the SUS plate is 10 mm or more in the holding force measurement performed according to JIS-Z-0237.
上記（１）のように、架橋前の状態で、温度４０℃でのズレ長さが５ｍｍ未満であれば、加熱前の常状において、優れた形状安定性や、加工適正を発揮することができる。
また、上記（２）のように、架橋前の状態で、温度８０℃でのズレ長さが１０ｍｍ以上であれば、例えば、２～４インチの比較的サイズの小さい積層体のみならず、たとえば、７インチ以上の比較的大きなサイズの積層体においても、６０℃～１００℃に加熱することで、貼合した部材を容易に分離することが可能となる。 As in (1) above, if the deviation length at a temperature of 40 ° C. is less than 5 mm in the state before crosslinking, excellent shape stability and processing suitability can be exhibited in the normal state before heating. it can.
Further, as described in the above (2), if the deviation length at a temperature of 80 ° C. is 10 mm or more in the state before crosslinking, not only a relatively small laminate of 2 to 4 inches, for example, Even in a laminate having a relatively large size of 7 inches or more, the bonded member can be easily separated by heating to 60 ° C. to 100 ° C.
また、上記（２）のように、架橋前の状態で、温度８０℃でのズレ長さが１０ｍｍ以上であれば、例えば、２～４インチの比較的サイズの小さい積層体のみならず、たとえば、７インチ以上の比較的大きなサイズの積層体においても、６０℃～１００℃に加熱することで、貼合した部材を容易に分離することが可能となる。 As in (1) above, if the deviation length at a temperature of 40 ° C. is less than 5 mm in the state before crosslinking, excellent shape stability and processing suitability can be exhibited in the normal state before heating. it can.
Further, as described in the above (2), if the deviation length at a temperature of 80 ° C. is 10 mm or more in the state before crosslinking, not only a relatively small laminate of 2 to 4 inches, for example, Even in a laminate having a relatively large size of 7 inches or more, the bonded member can be easily separated by heating to 60 ° C. to 100 ° C.
本粘着シートは、架橋前の状態で、次の（３）及び（４）を満たすことが好ましい。
（３）架橋前の前記透明粘着材からなる厚さ１５０μｍの粘着シートをソーダライムガラスに重ねて、２ｋｇのロールを１往復させてロール圧着した直後に、２３℃にて剥離角１８０°、剥離速度６０ｍｍ／分で、ソーダライムガラスから前記粘着シートを引き剥がした際の１８０°剥離力が５Ｎ／ｃｍ以上。
（４）架橋前の前記透明粘着材からなる厚さ１５０μｍの粘着シートをソーダライムガラスに重ねて、２ｋｇのロールを１往復させてロール圧着した直後に、８５℃にて剥離角１８０°、剥離速度６０ｍｍ／分で、ソーダライムガラスから前記粘着シートを引き剥がした際の１８０°剥離力が２Ｎ／ｃｍ未満。 The pressure-sensitive adhesive sheet preferably satisfies the following (3) and (4) in a state before crosslinking.
(3) A 150 μm thick adhesive sheet made of the transparent adhesive material before cross-linking is placed on soda lime glass, and a 2 kg roll is reciprocated once, and immediately after roll pressure bonding, a peeling angle of 180 ° is peeled off at 23 ° C. 180 ° peeling force when the adhesive sheet is peeled off from soda lime glass at a speed of 60 mm / min is 5 N / cm or more.
(4) A 150 μm-thick adhesive sheet made of the transparent adhesive material before cross-linking is placed on soda lime glass, and a 2 kg roll is reciprocated once, and immediately after roll pressure bonding, a peeling angle of 180 ° is peeled off at 85 ° C. The 180 ° peeling force when the adhesive sheet is peeled off from soda lime glass at a speed of 60 mm / min is less than 2 N / cm.
（３）架橋前の前記透明粘着材からなる厚さ１５０μｍの粘着シートをソーダライムガラスに重ねて、２ｋｇのロールを１往復させてロール圧着した直後に、２３℃にて剥離角１８０°、剥離速度６０ｍｍ／分で、ソーダライムガラスから前記粘着シートを引き剥がした際の１８０°剥離力が５Ｎ／ｃｍ以上。
（４）架橋前の前記透明粘着材からなる厚さ１５０μｍの粘着シートをソーダライムガラスに重ねて、２ｋｇのロールを１往復させてロール圧着した直後に、８５℃にて剥離角１８０°、剥離速度６０ｍｍ／分で、ソーダライムガラスから前記粘着シートを引き剥がした際の１８０°剥離力が２Ｎ／ｃｍ未満。 The pressure-sensitive adhesive sheet preferably satisfies the following (3) and (4) in a state before crosslinking.
(3) A 150 μm thick adhesive sheet made of the transparent adhesive material before cross-linking is placed on soda lime glass, and a 2 kg roll is reciprocated once, and immediately after roll pressure bonding, a peeling angle of 180 ° is peeled off at 23 ° C. 180 ° peeling force when the adhesive sheet is peeled off from soda lime glass at a speed of 60 mm / min is 5 N / cm or more.
(4) A 150 μm-thick adhesive sheet made of the transparent adhesive material before cross-linking is placed on soda lime glass, and a 2 kg roll is reciprocated once, and immediately after roll pressure bonding, a peeling angle of 180 ° is peeled off at 85 ° C. The 180 ° peeling force when the adhesive sheet is peeled off from soda lime glass at a speed of 60 mm / min is less than 2 N / cm.
上記（３）のように、架橋前の状態で、温度２３℃での１８０°剥離力が５Ｎ／ｃｍ以上であれば、通常状態、すなわち、室温状態において、剥離可能な程度の接着性（“タック性”と称する）を発現することができ、このようなタック性を備えていれば、貼合する際の位置決めを行いやすく、作業上とても便利である。
また、上記（４）のように、架橋前の状態で、温度８５℃での１８０°剥離力が２Ｎ未満であれば、貼合した後の部材について、加熱時の優れた再剥離性を付与することができる。 As in (3) above, if the 180 ° peeling force at a temperature of 23 ° C. is 5 N / cm or more in the state before crosslinking, the adhesiveness (“ If such tackiness is provided, positioning at the time of bonding is easy, which is very convenient for work.
Further, as in (4) above, if the 180 ° peeling force at a temperature of 85 ° C. is less than 2N in the state before cross-linking, excellent re-peelability at the time of heating is imparted to the member after pasting. can do.
また、上記（４）のように、架橋前の状態で、温度８５℃での１８０°剥離力が２Ｎ未満であれば、貼合した後の部材について、加熱時の優れた再剥離性を付与することができる。 As in (3) above, if the 180 ° peeling force at a temperature of 23 ° C. is 5 N / cm or more in the state before crosslinking, the adhesiveness (“ If such tackiness is provided, positioning at the time of bonding is easy, which is very convenient for work.
Further, as in (4) above, if the 180 ° peeling force at a temperature of 85 ° C. is less than 2N in the state before cross-linking, excellent re-peelability at the time of heating is imparted to the member after pasting. can do.
本粘着シートは、架橋後に、次の（５）及び（６）を満たすことが好ましい。
（５）架橋前の前記透明粘着材からなる厚さ１５０μｍの粘着シートをソーダライムガラスに重ねて、２ｋｇのロールを１往復させてロール圧着した後、前記透明粘着剤層に、波長３６５ｎｍの光が２０００ｍJ／ｃｍ２到達するように光を照射して前記透明粘着材を架橋させた状態で、温度２３℃にて剥離角１８０°、剥離速度６０ｍｍ／分で、ソーダライムガラスから前記粘着シートを引き剥がした際の１８０°剥離力が５Ｎ／ｃｍ以上。
（６）架橋前の前記透明粘着材からなる厚さ１５０μｍの粘着シートをソーダライムガラスに重ねて、２ｋｇのロールを１往復させてロール圧着した後、前記透明粘着剤層に、波長３６５ｎｍの光が２０００ｍJ／ｃｍ２到達するように光を照射して前記透明粘着材を架橋させた状態で、温度８５℃にて剥離角１８０°、剥離速度６０ｍｍ／分で、ソーダライムガラスから前記粘着シートを引き剥がした際の１８０°剥離力が５Ｎ／ｃｍ以上。 The pressure-sensitive adhesive sheet preferably satisfies the following (5) and (6) after crosslinking.
(5) After a 150 μm-thick adhesive sheet made of the transparent adhesive material before cross-linking is placed on soda lime glass, a 2 kg roll is reciprocated once and roll-bonded, and then light having a wavelength of 365 nm is applied to the transparent adhesive layer. in a state but which were crosslinked to the transparent adhesive material is irradiated with light to 2000 mJ / cm 2 reaches, peeling angle 180 ° at a temperature 23 ° C., at a peel rate of 60 mm / min, the pressure-sensitive adhesive sheet of soda-lime glass 180 ° peeling force when peeled off is 5 N / cm or more.
(6) A 150 μm-thick adhesive sheet made of the transparent adhesive material before cross-linking is placed on soda lime glass, a 2 kg roll is reciprocated once and roll-bonded, and then light having a wavelength of 365 nm is applied to the transparent adhesive layer. in a state but which were crosslinked to the transparent adhesive material is irradiated with light to 2000 mJ / cm 2 reaches, peeling angle 180 ° at a temperature 85 ° C., at a peel rate of 60 mm / min, the pressure-sensitive adhesive sheet of soda-lime glass 180 ° peeling force when peeled off is 5 N / cm or more.
（５）架橋前の前記透明粘着材からなる厚さ１５０μｍの粘着シートをソーダライムガラスに重ねて、２ｋｇのロールを１往復させてロール圧着した後、前記透明粘着剤層に、波長３６５ｎｍの光が２０００ｍJ／ｃｍ２到達するように光を照射して前記透明粘着材を架橋させた状態で、温度２３℃にて剥離角１８０°、剥離速度６０ｍｍ／分で、ソーダライムガラスから前記粘着シートを引き剥がした際の１８０°剥離力が５Ｎ／ｃｍ以上。
（６）架橋前の前記透明粘着材からなる厚さ１５０μｍの粘着シートをソーダライムガラスに重ねて、２ｋｇのロールを１往復させてロール圧着した後、前記透明粘着剤層に、波長３６５ｎｍの光が２０００ｍJ／ｃｍ２到達するように光を照射して前記透明粘着材を架橋させた状態で、温度８５℃にて剥離角１８０°、剥離速度６０ｍｍ／分で、ソーダライムガラスから前記粘着シートを引き剥がした際の１８０°剥離力が５Ｎ／ｃｍ以上。 The pressure-sensitive adhesive sheet preferably satisfies the following (5) and (6) after crosslinking.
(5) After a 150 μm-thick adhesive sheet made of the transparent adhesive material before cross-linking is placed on soda lime glass, a 2 kg roll is reciprocated once and roll-bonded, and then light having a wavelength of 365 nm is applied to the transparent adhesive layer. in a state but which were crosslinked to the transparent adhesive material is irradiated with light to 2000 mJ / cm 2 reaches, peeling angle 180 ° at a temperature 23 ° C., at a peel rate of 60 mm / min, the pressure-sensitive adhesive sheet of soda-lime glass 180 ° peeling force when peeled off is 5 N / cm or more.
(6) A 150 μm-thick adhesive sheet made of the transparent adhesive material before cross-linking is placed on soda lime glass, a 2 kg roll is reciprocated once and roll-bonded, and then light having a wavelength of 365 nm is applied to the transparent adhesive layer. in a state but which were crosslinked to the transparent adhesive material is irradiated with light to 2000 mJ / cm 2 reaches, peeling angle 180 ° at a temperature 85 ° C., at a peel rate of 60 mm / min, the pressure-sensitive adhesive sheet of soda-lime glass 180 ° peeling force when peeled off is 5 N / cm or more.
上記（５）のように、架橋後の状態で、温度２３℃での１８０°剥離力が５Ｎ／ｃｍ以上であれば、貼合した積層体の、常態における剥離などに対する信頼性を担保できるから好ましい。
また、上記（６）のように、架橋後の状態で、温度８３℃での１８０°剥離力が５Ｎ／ｃｍ以上であれば、耐久性に優れた積層体とすることができる。 As in (5) above, if the 180 ° peeling force at a temperature of 23 ° C. is 5 N / cm or more in the state after crosslinking, the reliability of the bonded laminate can be secured against peeling in a normal state. preferable.
Further, as in (6) above, if the 180 ° peeling force at a temperature of 83 ° C. is 5 N / cm or more in the state after crosslinking, a laminate having excellent durability can be obtained.
また、上記（６）のように、架橋後の状態で、温度８３℃での１８０°剥離力が５Ｎ／ｃｍ以上であれば、耐久性に優れた積層体とすることができる。 As in (5) above, if the 180 ° peeling force at a temperature of 23 ° C. is 5 N / cm or more in the state after crosslinking, the reliability of the bonded laminate can be secured against peeling in a normal state. preferable.
Further, as in (6) above, if the 180 ° peeling force at a temperature of 83 ° C. is 5 N / cm or more in the state after crosslinking, a laminate having excellent durability can be obtained.
＜粘着剤組成物＞
本粘着シートを形成するのに用いる粘着剤組成物の好ましい例、並びに、好ましい熱可塑性樹脂（Ａ）及び架橋剤（Ｂ）については後述する。ここでは先ず、光重合開始剤（Ｃ）及び波長変換剤（Ｄ）について説明する。 <Adhesive composition>
Preferred examples of the pressure-sensitive adhesive composition used for forming the present pressure-sensitive adhesive sheet, and preferable thermoplastic resin (A) and cross-linking agent (B) will be described later. Here, first, the photopolymerization initiator (C) and the wavelength conversion agent (D) will be described.
本粘着シートを形成するのに用いる粘着剤組成物の好ましい例、並びに、好ましい熱可塑性樹脂（Ａ）及び架橋剤（Ｂ）については後述する。ここでは先ず、光重合開始剤（Ｃ）及び波長変換剤（Ｄ）について説明する。 <Adhesive composition>
Preferred examples of the pressure-sensitive adhesive composition used for forming the present pressure-sensitive adhesive sheet, and preferable thermoplastic resin (A) and cross-linking agent (B) will be described later. Here, first, the photopolymerization initiator (C) and the wavelength conversion agent (D) will be described.
（光重合開始剤（Ｃ））
光重合開始剤（Ｃ）は、少なくとも波長３８０ｎｍ～４３０ｎｍの光線の照射によって、ラジカルを発生してベース樹脂の重合反応の起点となるものであればよい。
なお、「波長３８０ｎｍ～４３０ｎｍの光で反応する」の意味は、波長３８０ｎｍ～４３０ｎｍの範囲のいずれかの波長を有する光で反応すればよいという意味であって、他の領域の波長の光で反応することを許容するものである。概念的に言えば、可視光領域の波長を有する光で反応すれば、紫外線で反応してもよいという意味である。 (Photopolymerization initiator (C))
Any photopolymerization initiator (C) may be used as long as it generates radicals upon irradiation with light having a wavelength of 380 nm to 430 nm and serves as a starting point for the polymerization reaction of the base resin.
The meaning of “react with light having a wavelength of 380 nm to 430 nm” means that the reaction should be performed with light having any wavelength in the wavelength range of 380 nm to 430 nm. It is allowed to react. Conceptually, it means that if it reacts with light having a wavelength in the visible light region, it may react with ultraviolet rays.
光重合開始剤（Ｃ）は、少なくとも波長３８０ｎｍ～４３０ｎｍの光線の照射によって、ラジカルを発生してベース樹脂の重合反応の起点となるものであればよい。
なお、「波長３８０ｎｍ～４３０ｎｍの光で反応する」の意味は、波長３８０ｎｍ～４３０ｎｍの範囲のいずれかの波長を有する光で反応すればよいという意味であって、他の領域の波長の光で反応することを許容するものである。概念的に言えば、可視光領域の波長を有する光で反応すれば、紫外線で反応してもよいという意味である。 (Photopolymerization initiator (C))
Any photopolymerization initiator (C) may be used as long as it generates radicals upon irradiation with light having a wavelength of 380 nm to 430 nm and serves as a starting point for the polymerization reaction of the base resin.
The meaning of “react with light having a wavelength of 380 nm to 430 nm” means that the reaction should be performed with light having any wavelength in the wavelength range of 380 nm to 430 nm. It is allowed to react. Conceptually, it means that if it reacts with light having a wavelength in the visible light region, it may react with ultraviolet rays.
なお、光重合開始剤の反応性ラジカル発生機構は大きく２つに分類され、自身の共有結合を開裂し分解してラジカルを発生させる開裂型と、系中の水素供与体から水素を引抜き励起させラジカルを発生する水素引抜型とに分類される。
In addition, the reactive radical generation mechanism of the photopolymerization initiator is roughly classified into two types: a cleavage type that cleaves its own covalent bond and decomposes to generate radicals, and a hydrogen donor in the system that draws and excites hydrogen. It is classified as a hydrogen abstraction type that generates radicals.
光重合開始剤（Ｃ）としては、このうちのいずれでもよいが、特に開裂型が好ましい。
開裂型は、光照射によってラジカルを発生する際に分解して別の化合物となり、一度励起されると反応開始剤としての機能をもたなくなる。このため、３８０ｎｍ～４３０ｎｍの波長の光で反応する光重合開始剤（Ｃ）として該開裂型を用いると、水素引抜型を用いる場合に比べて、粘着シートに光照射を施した後、該光重合開始剤（Ｃ）が反応分解物となることで、３８０ｎｍ～４３０ｎｍ域の吸収がなくなり、照射光がより粘着シートの深部に到達しやすくなる。よって、光重合開始剤（Ｃ）としては、開裂型の光重合開始剤を用いるのが好ましい。 Any of these may be used as the photopolymerization initiator (C), but a cleavage type is particularly preferred.
The cleavage type decomposes when a radical is generated by light irradiation to form another compound, and once excited, it does not function as a reaction initiator. For this reason, when the cleavage mold is used as the photopolymerization initiator (C) that reacts with light having a wavelength of 380 nm to 430 nm, the light is applied to the pressure-sensitive adhesive sheet after the light irradiation to the pressure-sensitive adhesive sheet as compared with the case of using the hydrogen abstraction mold. When the polymerization initiator (C) becomes a reaction decomposition product, absorption in the region of 380 nm to 430 nm is lost, and irradiation light more easily reaches the deep part of the pressure-sensitive adhesive sheet. Therefore, it is preferable to use a cleavage type photopolymerization initiator as the photopolymerization initiator (C).
開裂型は、光照射によってラジカルを発生する際に分解して別の化合物となり、一度励起されると反応開始剤としての機能をもたなくなる。このため、３８０ｎｍ～４３０ｎｍの波長の光で反応する光重合開始剤（Ｃ）として該開裂型を用いると、水素引抜型を用いる場合に比べて、粘着シートに光照射を施した後、該光重合開始剤（Ｃ）が反応分解物となることで、３８０ｎｍ～４３０ｎｍ域の吸収がなくなり、照射光がより粘着シートの深部に到達しやすくなる。よって、光重合開始剤（Ｃ）としては、開裂型の光重合開始剤を用いるのが好ましい。 Any of these may be used as the photopolymerization initiator (C), but a cleavage type is particularly preferred.
The cleavage type decomposes when a radical is generated by light irradiation to form another compound, and once excited, it does not function as a reaction initiator. For this reason, when the cleavage mold is used as the photopolymerization initiator (C) that reacts with light having a wavelength of 380 nm to 430 nm, the light is applied to the pressure-sensitive adhesive sheet after the light irradiation to the pressure-sensitive adhesive sheet as compared with the case of using the hydrogen abstraction mold. When the polymerization initiator (C) becomes a reaction decomposition product, absorption in the region of 380 nm to 430 nm is lost, and irradiation light more easily reaches the deep part of the pressure-sensitive adhesive sheet. Therefore, it is preferable to use a cleavage type photopolymerization initiator as the photopolymerization initiator (C).
光重合開始剤（Ｃ）としては、例えば２－ベンジル－２－ジメチルアミノ－１－（４－モルフォリノフェニル）ブタン－１－オン、２－（４－メチルベンジル）－２－ジメチルアミノ－１－（４－モルフォリノフェニル）ブタン－１－オン、ビス（η５－２，４－シクロペンタジエン－１－イル）－ビス（２，６－ジフルオロ－３－（１Ｈ－ピロール－１－イル）フェニル）チタニウム、ビス（２，４，６－トリメチルベンゾイル）－フェニルフォスフィンオキサイド、２，４，６－トリメチルベンゾイルジフェニルフォスフィンオキサイド、チオキサントン、２－クロロチオキサントン、３－メチルチオキサントン、２，４－ジメチルチオキサントン、２－メチルアントラキノン、２－エチルアントラキノン、２－ｔｅｒｔ－ブチルアントラキノン、２－アミノアントラキノン、１，２－オクタンジオン,１－（４－（フェニルチオ）,２－（ｏ－ベンゾイルオキシム））等を挙げることができる。これらは、これらのうちの何れか一種またはその誘導体を用いてもよいし、又、これらのうちの二種類以上を組み合わせて用いてもよい。
Examples of the photopolymerization initiator (C) include 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butan-1-one and 2- (4-methylbenzyl) -2-dimethylamino-1. -(4-morpholinophenyl) butan-1-one, bis (η5-2,4-cyclopentadien-1-yl) -bis (2,6-difluoro-3- (1H-pyrrol-1-yl) phenyl ) Titanium, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, thioxanthone, 2-chlorothioxanthone, 3-methylthioxanthone, 2,4-dimethyl Thioxanthone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylan Rakinon, 2-aminoanthraquinone, 1,2-octane-dione, 1- (4- (phenylthio), 2- (o-benzoyl oxime)), and the like. Any one of these or derivatives thereof may be used, or two or more of these may be used in combination.
この中でも、開裂型光重合性開始剤であって、反応後に分解物となって消色する観点から、ビス（２，４，６－トリメチルベンゾイル）－フェニルフォスフィンオキサイド、２，４，６－トリメチルベンゾイルジフェニルフォスフィンオキサイドが好ましい。
Among these, it is a cleavage type photopolymerization initiator, and is a bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, 2,4,6- Trimethylbenzoyldiphenylphosphine oxide is preferred.
光重合開始剤（Ｃ）の反応性を調整するために、増感剤を併用することもできる。
増感剤としては、例えば各種アミン類や、アントラキノン、チオキサントンなどの化合物を挙げることができる。中でも、粘着組成物への溶解性に優れ、紫外線透過性を阻害しない点で、アミン系の増感剤が好ましい。 In order to adjust the reactivity of the photopolymerization initiator (C), a sensitizer can be used in combination.
Examples of the sensitizer include various amines and compounds such as anthraquinone and thioxanthone. Among these, amine-based sensitizers are preferable in that they are excellent in solubility in the pressure-sensitive adhesive composition and do not impair ultraviolet light transmittance.
増感剤としては、例えば各種アミン類や、アントラキノン、チオキサントンなどの化合物を挙げることができる。中でも、粘着組成物への溶解性に優れ、紫外線透過性を阻害しない点で、アミン系の増感剤が好ましい。 In order to adjust the reactivity of the photopolymerization initiator (C), a sensitizer can be used in combination.
Examples of the sensitizer include various amines and compounds such as anthraquinone and thioxanthone. Among these, amine-based sensitizers are preferable in that they are excellent in solubility in the pressure-sensitive adhesive composition and do not impair ultraviolet light transmittance.
（波長変換剤（Ｄ））
波長変換剤（Ｄ）は、波長３８０ｎｍより短波長側の光で励起され、少なくとも波長３８０ｎｍ～５５０ｎｍの光を発光するものが好ましい。
波長３８０ｎｍより短波長側の光で励起されればよく、中でも、励起領域として波長３７０ｎｍより短波長側の光を含むものが好ましい。
また、少なくとも波長３８０ｎｍ～５５０ｎｍのうちいずれかの波長域の光を発光すればよく、中でも、発光領域として波長３９０ｎｍ～５００ｎｍを含むものが好ましい。
かかる観点から、好ましい波長変換剤（Ｄ）として、例えばオキサゾール系蛍光体、トリアゾール系蛍光体、チオフェン系蛍光などを挙げることができ、これらのうちの一種を、又はこれらのうちの二種以上を組み合わせて用いることができる。 (Wavelength conversion agent (D))
The wavelength converting agent (D) is preferably one that is excited by light having a wavelength shorter than 380 nm and emits light having a wavelength of at least 380 nm to 550 nm.
What is necessary is just to be excited with the light of the shorter wavelength side than wavelength 380 nm, and what contains the light of the shorter wavelength side than wavelength 370 nm as an excitation area | region among these is preferable.
Further, it is sufficient to emit light in any wavelength region of at least a wavelength of 380 nm to 550 nm, and among them, a light emitting region including a wavelength of 390 nm to 500 nm is preferable.
From this point of view, examples of preferable wavelength conversion agent (D) include oxazole phosphors, triazole phosphors, thiophene fluorescence, and the like. One of these, or two or more of these may be used. They can be used in combination.
波長変換剤（Ｄ）は、波長３８０ｎｍより短波長側の光で励起され、少なくとも波長３８０ｎｍ～５５０ｎｍの光を発光するものが好ましい。
波長３８０ｎｍより短波長側の光で励起されればよく、中でも、励起領域として波長３７０ｎｍより短波長側の光を含むものが好ましい。
また、少なくとも波長３８０ｎｍ～５５０ｎｍのうちいずれかの波長域の光を発光すればよく、中でも、発光領域として波長３９０ｎｍ～５００ｎｍを含むものが好ましい。
かかる観点から、好ましい波長変換剤（Ｄ）として、例えばオキサゾール系蛍光体、トリアゾール系蛍光体、チオフェン系蛍光などを挙げることができ、これらのうちの一種を、又はこれらのうちの二種以上を組み合わせて用いることができる。 (Wavelength conversion agent (D))
The wavelength converting agent (D) is preferably one that is excited by light having a wavelength shorter than 380 nm and emits light having a wavelength of at least 380 nm to 550 nm.
What is necessary is just to be excited with the light of the shorter wavelength side than wavelength 380 nm, and what contains the light of the shorter wavelength side than wavelength 370 nm as an excitation area | region among these is preferable.
Further, it is sufficient to emit light in any wavelength region of at least a wavelength of 380 nm to 550 nm, and among them, a light emitting region including a wavelength of 390 nm to 500 nm is preferable.
From this point of view, examples of preferable wavelength conversion agent (D) include oxazole phosphors, triazole phosphors, thiophene fluorescence, and the like. One of these, or two or more of these may be used. They can be used in combination.
波長変換剤（Ｄ）は、熱可塑性樹脂（Ａ）に相溶する材料であるのが好ましい。波長変換剤（Ｄ）が、熱可塑性樹脂（Ａ）に相溶する材料であれば、透明をより一層高めることができる。
かかる観点から、有機系の蛍光体であるのが好ましい。 The wavelength conversion agent (D) is preferably a material that is compatible with the thermoplastic resin (A). If the wavelength converting agent (D) is a material compatible with the thermoplastic resin (A), the transparency can be further enhanced.
From this viewpoint, an organic phosphor is preferable.
かかる観点から、有機系の蛍光体であるのが好ましい。 The wavelength conversion agent (D) is preferably a material that is compatible with the thermoplastic resin (A). If the wavelength converting agent (D) is a material compatible with the thermoplastic resin (A), the transparency can be further enhanced.
From this viewpoint, an organic phosphor is preferable.
（波長変換剤（Ｄ）の濃度）
波長変換剤（Ｄ）の濃度が濃すぎると、波長変換剤（Ｄ）に遮断されて粘着シートの深部まで架橋用の光が届かない場合がある。また、波長変換剤（Ｄ）の濃度が薄くても、粘着シートの厚みが大きい場合には、やはり粘着シートの深部まで光が届かない場合もある。 (Concentration of wavelength converting agent (D))
If the concentration of the wavelength conversion agent (D) is too high, the wavelength conversion agent (D) may block the light for crosslinking to reach the deep part of the pressure-sensitive adhesive sheet. Further, even if the concentration of the wavelength converting agent (D) is low, if the thickness of the pressure-sensitive adhesive sheet is large, the light may not reach the deep part of the pressure-sensitive adhesive sheet.
波長変換剤（Ｄ）の濃度が濃すぎると、波長変換剤（Ｄ）に遮断されて粘着シートの深部まで架橋用の光が届かない場合がある。また、波長変換剤（Ｄ）の濃度が薄くても、粘着シートの厚みが大きい場合には、やはり粘着シートの深部まで光が届かない場合もある。 (Concentration of wavelength converting agent (D))
If the concentration of the wavelength conversion agent (D) is too high, the wavelength conversion agent (D) may block the light for crosslinking to reach the deep part of the pressure-sensitive adhesive sheet. Further, even if the concentration of the wavelength converting agent (D) is low, if the thickness of the pressure-sensitive adhesive sheet is large, the light may not reach the deep part of the pressure-sensitive adhesive sheet.
そこで、本粘着シートにおいては、粘着シートの波長３９０ｎｍにおける吸光度Ｘと、粘着シートの厚みＹとが、次の関係式（１）を満足するように、波長変換剤（Ｄ）の濃度及び粘着シートの厚みなどを調整することが好ましい。
式（１）・・・０．５≦Ｘ／Ｙ≦１２ Therefore, in this pressure-sensitive adhesive sheet, the concentration of the wavelength converting agent (D) and the pressure-sensitive adhesive sheet so that the absorbance X at a wavelength of 390 nm of the pressure-sensitive adhesive sheet and the thickness Y of the pressure-sensitive adhesive sheet satisfy the following relational expression (1). It is preferable to adjust the thickness and the like.
Formula (1) ... 0.5 <= X / Y <= 12
式（１）・・・０．５≦Ｘ／Ｙ≦１２ Therefore, in this pressure-sensitive adhesive sheet, the concentration of the wavelength converting agent (D) and the pressure-sensitive adhesive sheet so that the absorbance X at a wavelength of 390 nm of the pressure-sensitive adhesive sheet and the thickness Y of the pressure-sensitive adhesive sheet satisfy the following relational expression (1). It is preferable to adjust the thickness and the like.
Formula (1) ... 0.5 <= X / Y <= 12
中でも、式（２）を満足するように調整することがさらに好ましい。
式（２）・・・０．７≦Ｘ／Ｙ≦１１
さらにその中でも、式（３）を満足するように調整することがさらに好ましい。
式（３）・・・０．９≦Ｘ／Ｙ≦１０ Among these, it is more preferable to adjust so as to satisfy the formula (2).
Formula (2)... 0.7 ≦ X / Y ≦ 11
Furthermore, among these, it is more preferable to adjust so that Formula (3) may be satisfied.
Formula (3): 0.9 ≦ X / Y ≦ 10
式（２）・・・０．７≦Ｘ／Ｙ≦１１
さらにその中でも、式（３）を満足するように調整することがさらに好ましい。
式（３）・・・０．９≦Ｘ／Ｙ≦１０ Among these, it is more preferable to adjust so as to satisfy the formula (2).
Formula (2)... 0.7 ≦ X / Y ≦ 11
Furthermore, among these, it is more preferable to adjust so that Formula (3) may be satisfied.
Formula (3): 0.9 ≦ X / Y ≦ 10
また、上記同様の観点から、本粘着シートの波長３９０ｎｍにおける透過率が３～９５％、中でも５％以上或いは８５％以下、その中でも７％以上或いは８０％以下の範囲内になるように、波長変換剤（Ｄ）の濃度を調整するのが好ましい。
Further, from the same viewpoint as described above, the transmittance of the pressure-sensitive adhesive sheet at a wavelength of 390 nm is 3 to 95%, particularly 5% or more and 85% or less, of which 7% or 80% or less. It is preferable to adjust the concentration of the conversion agent (D).
＜剥離フィルム付粘着シート＞
本粘着シートは、表裏一側又は両側に剥離フィルムを備えた剥離フィルム付粘着シートであってもよい。 <Adhesive sheet with release film>
This pressure-sensitive adhesive sheet may be a pressure-sensitive adhesive sheet with a release film provided with a release film on one side or both sides.
本粘着シートは、表裏一側又は両側に剥離フィルムを備えた剥離フィルム付粘着シートであってもよい。 <Adhesive sheet with release film>
This pressure-sensitive adhesive sheet may be a pressure-sensitive adhesive sheet with a release film provided with a release film on one side or both sides.
この際、本粘着シートに用いる剥離フィルムは、少なくとも表裏一側の剥離フィルムが、波長３８０ｎｍより短波長側の光の光線透過率が４０％以下、中でも３５％以下、その中でも３０％以下であるフィルムであるのが特に好ましい。
剥離フィルムが、波長３８０ｎｍより短波長側の光の光線透過率が４０％以下であるフィルムであれば、反応開始に係る光をある程度遮断することができるから、例えば保存状態において、光重合開始剤（Ｃ）の反応開始を抑制することができる共に、波長変換剤（Ｄ）の励起を抑制することができる。 At this time, the release film used in the present adhesive sheet is such that at least the release film on one side of the front and back sides has a light transmittance of 40% or less, particularly 35% or less, particularly 30% or less of light having a wavelength shorter than 380 nm. Particularly preferred is a film.
If the release film is a film having a light transmittance of 40% or less for light having a wavelength shorter than 380 nm, the light for starting the reaction can be blocked to some extent. While the reaction start of (C) can be suppressed, excitation of the wavelength converting agent (D) can be suppressed.
剥離フィルムが、波長３８０ｎｍより短波長側の光の光線透過率が４０％以下であるフィルムであれば、反応開始に係る光をある程度遮断することができるから、例えば保存状態において、光重合開始剤（Ｃ）の反応開始を抑制することができる共に、波長変換剤（Ｄ）の励起を抑制することができる。 At this time, the release film used in the present adhesive sheet is such that at least the release film on one side of the front and back sides has a light transmittance of 40% or less, particularly 35% or less, particularly 30% or less of light having a wavelength shorter than 380 nm. Particularly preferred is a film.
If the release film is a film having a light transmittance of 40% or less for light having a wavelength shorter than 380 nm, the light for starting the reaction can be blocked to some extent. While the reaction start of (C) can be suppressed, excitation of the wavelength converting agent (D) can be suppressed.
波長３８０ｎｍより短波長側の光の光線透過率が４０％以下である剥離フィルムとしては、例えば紫外線吸収剤を含有するフィルム、紫外線吸収剤を表面に塗布乃至印刷したフィルム、紫外線吸収剤を含有する層を積層してなるフィルム、紙製の剥離フィルムなどを挙げることができる。
Examples of the release film having a light transmittance of 40% or less of light having a wavelength shorter than 380 nm include, for example, a film containing an ultraviolet absorber, a film coated or printed with an ultraviolet absorber, and an ultraviolet absorber. A film formed by laminating layers, a paper release film, and the like can be given.
＜用途＞
本粘着シートは、例えば画像表示装置を構成する画像表示装置構成用部材を貼り合せるのに好ましく用いることができる。但し、本粘着シートの用途をこのような用途に限定するものではない。 <Application>
This pressure-sensitive adhesive sheet can be preferably used for bonding image display device constituting members constituting the image display device, for example. However, the application of the present adhesive sheet is not limited to such an application.
本粘着シートは、例えば画像表示装置を構成する画像表示装置構成用部材を貼り合せるのに好ましく用いることができる。但し、本粘着シートの用途をこのような用途に限定するものではない。 <Application>
This pressure-sensitive adhesive sheet can be preferably used for bonding image display device constituting members constituting the image display device, for example. However, the application of the present adhesive sheet is not limited to such an application.
かかる画像表示装置としては、例えばパソコン、モバイル端末（ＰＤＡ）、ゲーム機、テレビ（ＴＶ）、カーナビ、タッチパネル、ペンタブレットなどを挙げることができる。但し、これらに限定するものではない。
Examples of such an image display device include a personal computer, a mobile terminal (PDA), a game machine, a television (TV), a car navigation system, a touch panel, and a pen tablet. However, it is not limited to these.
また、画像表示装置構成用部材の具体例としては、例えばタッチパネル、画像表示パネル、表面保護パネル、位相差フィルム、偏光フィルムなどを挙げることができ、これらのうちの何れかであってもよいし、これらのうちの２種類以上が既に積層された積層体であってもよい。但し、これらに限定するものではない。
Specific examples of the image display device constituting member include a touch panel, an image display panel, a surface protection panel, a retardation film, a polarizing film, and the like, and any of these may be used. A laminate in which two or more of these are already laminated may be used. However, it is not limited to these.
＜本粘着剤組成物＞
上述した本粘着剤組成物の好ましい例として、粘着剤組成物(I)、（ＩＩ）について説明する。但し、本粘着剤組成物が次の粘着剤組成物(I)、（ＩＩ）に限定されるものではない。 <This pressure-sensitive adhesive composition>
As preferred examples of the above-mentioned pressure-sensitive adhesive composition, pressure-sensitive adhesive compositions (I) and (II) will be described. However, the present pressure-sensitive adhesive composition is not limited to the following pressure-sensitive adhesive compositions (I) and (II).
上述した本粘着剤組成物の好ましい例として、粘着剤組成物(I)、（ＩＩ）について説明する。但し、本粘着剤組成物が次の粘着剤組成物(I)、（ＩＩ）に限定されるものではない。 <This pressure-sensitive adhesive composition>
As preferred examples of the above-mentioned pressure-sensitive adhesive composition, pressure-sensitive adhesive compositions (I) and (II) will be described. However, the present pressure-sensitive adhesive composition is not limited to the following pressure-sensitive adhesive compositions (I) and (II).
なお、本粘着シートを、多層のシートとする場合には、最外層は、上記単層の場合と同様に、凹凸追随性と耐発泡信頼性とを兼ね備えているのが好ましいから、粘着剤組成物、例えば粘着剤組成物(I)、(II)を用いて形成するのが好ましい。
他方、中間層は、画像表示装置構成部材との粘着には寄与しないため、透明性を損なわず、かつ最外層の２次硬化反応を阻害しない程度の光透過性を有し、かつ、カット性及びハンドリング性を高める性質を有しているのが好ましい。
中間層を形成するベースポリマーの種類は、透明樹脂であれば、特に限定するものではない。中間層を形成するベースポリマーは、最外層のベースポリマーと同一の樹脂であっても異なる樹脂であってもよい。中でも、透明性の確保や作製し易さ、さらには積層境界面での光の屈折を防ぐ観点から、最外層のベースポリマーと同一のアクリル系樹脂を用いるのが好ましい。
中間層及び他の樹脂層は、活性エネルギー線硬化性を有していてもいなくてもよい。例えば紫外線架橋によって硬化するように形成してもよいし、熱によって硬化するように形成してもよい。また、特に後硬化しないように形成してもよい。但し、最外層との密着性等を考慮すると、後硬化するように形成するのが好ましく、特に紫外線架橋するように形成するのが好ましい。
その際、架橋開始剤の含有量が多くなると光透過率が低下するため、中間層における架橋開始剤の外層における含有率よりも低い含有率で紫外線架橋剤を含むのが好ましい。 In the case where the pressure-sensitive adhesive sheet is a multilayer sheet, the outermost layer preferably has both uneven followability and foam resistance reliability as in the case of the single layer. It is preferable to form the product using, for example, the pressure-sensitive adhesive compositions (I) and (II).
On the other hand, since the intermediate layer does not contribute to adhesion with the image display device constituent member, it does not impair the transparency, and has a light transmittance that does not hinder the secondary curing reaction of the outermost layer, and has a cutting property. In addition, it preferably has a property of improving handling properties.
If the kind of base polymer which forms an intermediate | middle layer is transparent resin, it will not specifically limit. The base polymer forming the intermediate layer may be the same resin as the base polymer of the outermost layer or a different resin. Among these, it is preferable to use the same acrylic resin as the base polymer of the outermost layer from the viewpoints of ensuring transparency and ease of production, and preventing light refraction at the lamination boundary surface.
The intermediate layer and other resin layers may or may not have active energy ray curability. For example, it may be formed so as to be cured by ultraviolet crosslinking or may be formed so as to be cured by heat. Further, it may be formed so as not to be post-cured. However, in consideration of adhesion to the outermost layer, etc., it is preferably formed so as to be post-cured, and particularly preferably formed so as to be UV-crosslinked.
In that case, since light transmittance will fall, if content of a crosslinking initiator increases, it is preferable to contain a ultraviolet-ray crosslinking agent by the content rate lower than the content rate in the outer layer of the crosslinking initiator in an intermediate | middle layer.
他方、中間層は、画像表示装置構成部材との粘着には寄与しないため、透明性を損なわず、かつ最外層の２次硬化反応を阻害しない程度の光透過性を有し、かつ、カット性及びハンドリング性を高める性質を有しているのが好ましい。
中間層を形成するベースポリマーの種類は、透明樹脂であれば、特に限定するものではない。中間層を形成するベースポリマーは、最外層のベースポリマーと同一の樹脂であっても異なる樹脂であってもよい。中でも、透明性の確保や作製し易さ、さらには積層境界面での光の屈折を防ぐ観点から、最外層のベースポリマーと同一のアクリル系樹脂を用いるのが好ましい。
中間層及び他の樹脂層は、活性エネルギー線硬化性を有していてもいなくてもよい。例えば紫外線架橋によって硬化するように形成してもよいし、熱によって硬化するように形成してもよい。また、特に後硬化しないように形成してもよい。但し、最外層との密着性等を考慮すると、後硬化するように形成するのが好ましく、特に紫外線架橋するように形成するのが好ましい。
その際、架橋開始剤の含有量が多くなると光透過率が低下するため、中間層における架橋開始剤の外層における含有率よりも低い含有率で紫外線架橋剤を含むのが好ましい。 In the case where the pressure-sensitive adhesive sheet is a multilayer sheet, the outermost layer preferably has both uneven followability and foam resistance reliability as in the case of the single layer. It is preferable to form the product using, for example, the pressure-sensitive adhesive compositions (I) and (II).
On the other hand, since the intermediate layer does not contribute to adhesion with the image display device constituent member, it does not impair the transparency, and has a light transmittance that does not hinder the secondary curing reaction of the outermost layer, and has a cutting property. In addition, it preferably has a property of improving handling properties.
If the kind of base polymer which forms an intermediate | middle layer is transparent resin, it will not specifically limit. The base polymer forming the intermediate layer may be the same resin as the base polymer of the outermost layer or a different resin. Among these, it is preferable to use the same acrylic resin as the base polymer of the outermost layer from the viewpoints of ensuring transparency and ease of production, and preventing light refraction at the lamination boundary surface.
The intermediate layer and other resin layers may or may not have active energy ray curability. For example, it may be formed so as to be cured by ultraviolet crosslinking or may be formed so as to be cured by heat. Further, it may be formed so as not to be post-cured. However, in consideration of adhesion to the outermost layer, etc., it is preferably formed so as to be post-cured, and particularly preferably formed so as to be UV-crosslinked.
In that case, since light transmittance will fall, if content of a crosslinking initiator increases, it is preferable to contain a ultraviolet-ray crosslinking agent by the content rate lower than the content rate in the outer layer of the crosslinking initiator in an intermediate | middle layer.
本粘着シートを多層の粘着シートとする場合、積層構成としては、具体的には、例えば粘着剤組成物(I)、(II)と、他の粘着剤組成物とを積層した２種２層構成や、中間樹脂層を介して表裏に、粘着剤組成物(I)、(II)を配した２種３層構成や、粘着剤組成物(I)、(II)と、中間樹脂組成物と、他の粘着剤組成物とをこの順に積層してなる３種３層構成などを挙げることができる。
When this pressure-sensitive adhesive sheet is a multi-layered pressure-sensitive adhesive sheet, the laminated structure specifically includes, for example, two types and two layers in which pressure-sensitive adhesive compositions (I) and (II) and other pressure-sensitive adhesive compositions are stacked. Composition, two types and three layers with adhesive compositions (I) and (II) arranged on the front and back via an intermediate resin layer, adhesive compositions (I) and (II), and an intermediate resin composition And a three-layer three-layer structure in which other pressure-sensitive adhesive compositions are laminated in this order.
＜粘着剤組成物(I)＞
粘着剤組成物(I)として、枝成分としてマクロモノマーを備えたグラフト共重合体からなるアクリル系共重合体（Ａ１）と、架橋剤（Ｂ１）と、光重合開始剤（Ｃ１）と、波長変換剤（Ｄ１）とを含有する樹脂組成物を挙げることができる。 <Adhesive composition (I)>
As the pressure-sensitive adhesive composition (I), an acrylic copolymer (A1) comprising a graft copolymer having a macromonomer as a branch component, a crosslinking agent (B1), a photopolymerization initiator (C1), a wavelength The resin composition containing a conversion agent (D1) can be mentioned.
粘着剤組成物(I)として、枝成分としてマクロモノマーを備えたグラフト共重合体からなるアクリル系共重合体（Ａ１）と、架橋剤（Ｂ１）と、光重合開始剤（Ｃ１）と、波長変換剤（Ｄ１）とを含有する樹脂組成物を挙げることができる。 <Adhesive composition (I)>
As the pressure-sensitive adhesive composition (I), an acrylic copolymer (A1) comprising a graft copolymer having a macromonomer as a branch component, a crosslinking agent (B1), a photopolymerization initiator (C1), a wavelength The resin composition containing a conversion agent (D1) can be mentioned.
（アクリル系共重合体（Ａ１））
前記アクリル系共重合体（Ａ１）は、枝成分としてマクロモノマーを備えたグラフト共重合体であればよい。 (Acrylic copolymer (A1))
The acrylic copolymer (A1) may be a graft copolymer having a macromonomer as a branch component.
前記アクリル系共重合体（Ａ１）は、枝成分としてマクロモノマーを備えたグラフト共重合体であればよい。 (Acrylic copolymer (A1))
The acrylic copolymer (A1) may be a graft copolymer having a macromonomer as a branch component.
（幹成分）
前記アクリル系共重合体（Ａ１）の幹成分は、（メタ）アクリル酸エステル由来の繰り返し単位を含有する共重合体成分から構成されるのが好ましい。 (Stem component)
The trunk component of the acrylic copolymer (A1) is preferably composed of a copolymer component containing a repeating unit derived from a (meth) acrylic acid ester.
前記アクリル系共重合体（Ａ１）の幹成分は、（メタ）アクリル酸エステル由来の繰り返し単位を含有する共重合体成分から構成されるのが好ましい。 (Stem component)
The trunk component of the acrylic copolymer (A1) is preferably composed of a copolymer component containing a repeating unit derived from a (meth) acrylic acid ester.
前記アクリル系共重合体（Ａ１）の幹成分を構成する共重合体のガラス転移温度は－７０～０℃であるのが好ましい。
この際、幹成分を構成する共重合体成分のガラス転移温度とは、アクリル系共重合体（Ａ１）の幹成分を組成するモノマー成分のみを共重合して得られるポリマーのガラス転移温度をさす。具体的には、当該共重合体各成分のホモポリマーから得られるポリマーのガラス転移温度と構成比率から、Ｆｏｘの計算式によって算出される値を意味する。
なお、Ｆｏｘの計算式とは、以下の式により求められる計算値であり、ポリマーハンドブック〔Ｐｏｌｙｍｅｒ ＨａｎｄＢｏｏｋ，Ｊ．Ｂｒａｎｄｒｕｐ，Ｉｎｔｅｒｓｃｉｅｎｃｅ，１９８９〕に記載されている値を用いて求めることができる。
１／（２７３＋Ｔｇ）＝Σ（Ｗｉ／（２７３＋Ｔｇｉ））
［式中、Ｗｉはモノマーｉの重量分率、ＴｇｉはモノマーｉのホモポリマーのＴｇ（℃）を示す。］ The glass transition temperature of the copolymer constituting the trunk component of the acrylic copolymer (A1) is preferably −70 to 0 ° C.
In this case, the glass transition temperature of the copolymer component constituting the trunk component refers to the glass transition temperature of the polymer obtained by copolymerizing only the monomer component constituting the trunk component of the acrylic copolymer (A1). . Specifically, it means a value calculated by the Fox formula from the glass transition temperature and the composition ratio of the polymer obtained from the homopolymer of each component of the copolymer.
In addition, the calculation formula of Fox is a calculation value calculated | required by the following formula | equation, Polymer handbook [Polymer HandBook, J.M. Brandrup, Interscience, 1989].
1 / (273 + Tg) = Σ (Wi / (273 + Tgi))
[Wherein Wi represents the weight fraction of monomer i, and Tgi represents Tg (° C.) of the homopolymer of monomer i. ]
この際、幹成分を構成する共重合体成分のガラス転移温度とは、アクリル系共重合体（Ａ１）の幹成分を組成するモノマー成分のみを共重合して得られるポリマーのガラス転移温度をさす。具体的には、当該共重合体各成分のホモポリマーから得られるポリマーのガラス転移温度と構成比率から、Ｆｏｘの計算式によって算出される値を意味する。
なお、Ｆｏｘの計算式とは、以下の式により求められる計算値であり、ポリマーハンドブック〔Ｐｏｌｙｍｅｒ ＨａｎｄＢｏｏｋ，Ｊ．Ｂｒａｎｄｒｕｐ，Ｉｎｔｅｒｓｃｉｅｎｃｅ，１９８９〕に記載されている値を用いて求めることができる。
１／（２７３＋Ｔｇ）＝Σ（Ｗｉ／（２７３＋Ｔｇｉ））
［式中、Ｗｉはモノマーｉの重量分率、ＴｇｉはモノマーｉのホモポリマーのＴｇ（℃）を示す。］ The glass transition temperature of the copolymer constituting the trunk component of the acrylic copolymer (A1) is preferably −70 to 0 ° C.
In this case, the glass transition temperature of the copolymer component constituting the trunk component refers to the glass transition temperature of the polymer obtained by copolymerizing only the monomer component constituting the trunk component of the acrylic copolymer (A1). . Specifically, it means a value calculated by the Fox formula from the glass transition temperature and the composition ratio of the polymer obtained from the homopolymer of each component of the copolymer.
In addition, the calculation formula of Fox is a calculation value calculated | required by the following formula | equation, Polymer handbook [Polymer HandBook, J.M. Brandrup, Interscience, 1989].
1 / (273 + Tg) = Σ (Wi / (273 + Tgi))
[Wherein Wi represents the weight fraction of monomer i, and Tgi represents Tg (° C.) of the homopolymer of monomer i. ]
前記アクリル系共重合体（Ａ１）の幹成分を構成する共重合体成分のガラス転移温度は、室温状態での粘着剤組成物(I)の柔軟性や、被着体への粘着剤組成物(I)の濡れ性、すなわち接着性に影響するため、粘着剤組成物(I)が室温状態で適度な接着性（タック性）を得るためには、当該ガラス転移温度は、－７０℃～０℃であるのが好ましく、中でも－６５℃以上或いは－５℃以下、その中でも－６０℃以上或いは－１０℃以下であるのが特に好ましい。
The glass transition temperature of the copolymer component constituting the trunk component of the acrylic copolymer (A1) is the flexibility of the pressure-sensitive adhesive composition (I) at room temperature and the pressure-sensitive adhesive composition to the adherend. Since the adhesive composition (I) affects the wettability of (I), that is, the adhesiveness, the glass transition temperature is −70 ° C. to obtain an appropriate adhesive property (tackiness) at room temperature. It is preferably 0 ° C., more preferably −65 ° C. or higher or −5 ° C. or lower, and particularly preferably −60 ° C. or higher or −10 ° C. or lower.
但し、当該共重合体成分のガラス転移温度が同じ温度であったとしても、分子量を調整することにより粘弾性を調整することができる。例えば共重合体成分の分子量を小さくすることにより、より柔軟化させることができる。
However, even if the glass transition temperature of the copolymer component is the same temperature, the viscoelasticity can be adjusted by adjusting the molecular weight. For example, it can be made more flexible by reducing the molecular weight of the copolymer component.
前記アクリル系共重合体（Ａ１）の幹成分が含有する（メタ）アクリル酸エステルモノマーとしては、例えばメチル（メタ）アクリレート、エチル（メタ）アクリレート、プロピル（メタ）アクリレート、イソプロピル（メタ）アクリレート、ｎ－ブチル（メタ）アクリレート、イソブチル（メタ）アクリレート、ｓｅｃ－ブチル（メタ）アクリレート、ｔ-ブチル（メタ）アクリレート、ペンチル（メタ）アクリレート、イソペンチル（メタ）アクリレート、ネオペンチル（メタ）アクリレート、ヘキシル（メタ）アクリレート、シクロヘキシル（メタ）アクリレート、ヘプチル（メタ）アクリレート、２－エチルヘキシル（メタ）アクリレート、ｎ－オクチル（メタ）アクリート、イソオクチル（メタ）アクリレート、ノニル（メタ）アクリレート、イソノニル（メタ）アクリレート、ｔ－ブチルシクロヘキシル（メタ）アクリレート、デシル（メタ）アクリレート、イソデシル（メタ）アクリレート、ウンデシル（メタ）アクリレート、ラウリル（メタ）アクリレート、セチル（メタ）アクリレート、ステアリル（メタ）アクリレート、イソステアリル（メタ）アクリレート、ベヘニル（メタ）アクリレート、イソボルニル（メタ）アクリレート、２－フェノキシエチル（メタ）アクリレート、３，５，５－トリメチルシクロヘキサンアクリレート、ｐ－クミルフェノールＥＯ変性（メタ）アクリレート、ジシクロペンタニル（メタ）アクリレート、ジシクロペンテニル（メタ）アクリレート、ジシクロペンテニルオキシエチル（メタ）アクリレート、ベンジル（メタ）アクリレート等を挙げることができる。これらに、親水基や有機官能基などをもつヒドロキシエチル（メタ）アクリレート、ヒドロキシプロピル（メタ）アクリレート、ヒドロキシブチル（メタ）アクリレート、グリセロール（メタ）アクリレート等の水酸基含有（メタ）アクリレートや、（メタ）アクリル酸、２－（メタ）アクリロイルオキシエチルヘキサヒドロフタル酸、２－（メタ）アクリロイルオキシプロピルヘキサヒドロフタル酸、２－（メタ）アクリロイルオキシエチルフタル酸、２－（メタ）アクリロイルオキシプロピルフタル酸、２－（メタ）アクリロイルオキシエチルマレイン酸、２－（メタ）アクリロイルオキシプロピルマレイン酸、２－（メタ）アクリロイルオキシエチルコハク酸、２－（メタ）アクリロイルオキシプロピルコハク酸、クロトン酸、フマル酸、マレイン酸、イタコン酸、マレイン酸モノメチル、イタコン酸モノメチル等のカルボキシル基含有モノマー、無水マレイン酸、無水イタコン酸等の酸無水物基含有モノマー、（メタ）アクリル酸グリシジル、α－エチルアクリル酸グリシジル、（メタ）アクリル酸３，４－エポキシブチル等のエポキシ基含有モノマー、ジメチルアミノエチル（メタ）アクリレート、ジエチルアミノエチル（メタ）アクリレート等のアミノ基含有（メタ）アクリル酸エステル系モノマー、（メタ）アクリルアミド、Ｎ－ｔ－ブチル（メタ）アクリルアミド、Ｎ－メチロール（メタ）アクリルアミド、Ｎ－メトキシメチル（メタ）アクリルアミド、Ｎ－ブトキシメチル（メタ）アクリルアミド、ダイアセトン（メタ）アクリルアミド、マレイン酸アミド、マレイミド等のアミド基を含有するモノマー、ビニルピロリドン、ビニルピリジン、ビニルカルバゾール等の複素環系塩基性モノマー等を用いることもできる。
また、上記アクリルモノマーやメタクリルモノマーと共重合可能な、スチレン、ｔ－ブチルスチレン、α－メチルスチレン、ビニルトルエン、アクリロニトリル、メタクリロニトニル、酢酸ビニル、プロピオン酸ビニル、アルキルビニルエーテル、ヒドロキシアルキルビニルエーテル、アルキルビニルモノマー等の各種ビニルモノマーも適宜用いることができる。 Examples of the (meth) acrylic acid ester monomer contained in the main component of the acrylic copolymer (A1) include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, sec-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, isopentyl (meth) acrylate, neopentyl (meth) acrylate, hexyl ( (Meth) acrylate, cyclohexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate Relate, isononyl (meth) acrylate, t-butylcyclohexyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, lauryl (meth) acrylate, cetyl (meth) acrylate, stearyl (meth) ) Acrylate, isostearyl (meth) acrylate, behenyl (meth) acrylate, isobornyl (meth) acrylate, 2-phenoxyethyl (meth) acrylate, 3,5,5-trimethylcyclohexane acrylate, p-cumylphenol EO modified (meta ) Acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, benzyl (meth) acrylate Mention may be made of the over door or the like. These include hydroxyl-containing (meth) acrylates such as hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, and glycerol (meth) acrylate having a hydrophilic group or an organic functional group, ) Acrylic acid, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, 2- (meth) acryloyloxypropyl hexahydrophthalic acid, 2- (meth) acryloyloxyethyl phthalic acid, 2- (meth) acryloyloxypropyl phthalate Acid, 2- (meth) acryloyloxyethylmaleic acid, 2- (meth) acryloyloxypropylmaleic acid, 2- (meth) acryloyloxyethylsuccinic acid, 2- (meth) acryloyloxypropylsuccinic acid, crotonic acid, fumaric acid Carboxyl group-containing monomers such as maleic acid, itaconic acid, monomethyl maleate and monomethyl itaconic acid, acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride, glycidyl (meth) acrylate, glycidyl α-ethyl acrylate , Epoxy group-containing monomers such as 3,4-epoxybutyl (meth) acrylate, amino group-containing (meth) acrylate monomers such as dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, (meth) Acrylamide, Nt-butyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, diacetone (meth) acrylamide, maleic acid amide, male Monomers containing an amide group such as imide, heterocyclic basic monomers such as vinyl pyrrolidone, vinyl pyridine, and vinyl carbazole can also be used.
In addition, styrene, t-butylstyrene, α-methylstyrene, vinyltoluene, acrylonitrile, methacrylonitrile, vinyl acetate, vinyl propionate, alkyl vinyl ether, hydroxyalkyl vinyl ether, alkyl, which can be copolymerized with the above acrylic monomers and methacrylic monomers. Various vinyl monomers such as vinyl monomers can also be used as appropriate.
また、上記アクリルモノマーやメタクリルモノマーと共重合可能な、スチレン、ｔ－ブチルスチレン、α－メチルスチレン、ビニルトルエン、アクリロニトリル、メタクリロニトニル、酢酸ビニル、プロピオン酸ビニル、アルキルビニルエーテル、ヒドロキシアルキルビニルエーテル、アルキルビニルモノマー等の各種ビニルモノマーも適宜用いることができる。 Examples of the (meth) acrylic acid ester monomer contained in the main component of the acrylic copolymer (A1) include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, sec-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, isopentyl (meth) acrylate, neopentyl (meth) acrylate, hexyl ( (Meth) acrylate, cyclohexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate Relate, isononyl (meth) acrylate, t-butylcyclohexyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, lauryl (meth) acrylate, cetyl (meth) acrylate, stearyl (meth) ) Acrylate, isostearyl (meth) acrylate, behenyl (meth) acrylate, isobornyl (meth) acrylate, 2-phenoxyethyl (meth) acrylate, 3,5,5-trimethylcyclohexane acrylate, p-cumylphenol EO modified (meta ) Acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, benzyl (meth) acrylate Mention may be made of the over door or the like. These include hydroxyl-containing (meth) acrylates such as hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, and glycerol (meth) acrylate having a hydrophilic group or an organic functional group, ) Acrylic acid, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, 2- (meth) acryloyloxypropyl hexahydrophthalic acid, 2- (meth) acryloyloxyethyl phthalic acid, 2- (meth) acryloyloxypropyl phthalate Acid, 2- (meth) acryloyloxyethylmaleic acid, 2- (meth) acryloyloxypropylmaleic acid, 2- (meth) acryloyloxyethylsuccinic acid, 2- (meth) acryloyloxypropylsuccinic acid, crotonic acid, fumaric acid Carboxyl group-containing monomers such as maleic acid, itaconic acid, monomethyl maleate and monomethyl itaconic acid, acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride, glycidyl (meth) acrylate, glycidyl α-ethyl acrylate , Epoxy group-containing monomers such as 3,4-epoxybutyl (meth) acrylate, amino group-containing (meth) acrylate monomers such as dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, (meth) Acrylamide, Nt-butyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, diacetone (meth) acrylamide, maleic acid amide, male Monomers containing an amide group such as imide, heterocyclic basic monomers such as vinyl pyrrolidone, vinyl pyridine, and vinyl carbazole can also be used.
In addition, styrene, t-butylstyrene, α-methylstyrene, vinyltoluene, acrylonitrile, methacrylonitrile, vinyl acetate, vinyl propionate, alkyl vinyl ether, hydroxyalkyl vinyl ether, alkyl, which can be copolymerized with the above acrylic monomers and methacrylic monomers. Various vinyl monomers such as vinyl monomers can also be used as appropriate.
また、アクリル系共重合体（Ａ１）の幹成分は、疎水性の（メタ）アクリレートモノマーと、親水性の（メタ）アクリレートモノマーとを構成単位として含有するのが好ましい。
アクリル系共重合体（Ａ１）の幹成分が、疎水性モノマーのみから構成されると、湿熱白化する傾向が認められるため、親水性モノマーも幹成分に導入して湿熱白化を防止するのが好ましい。
具体的には、上記アクリル系共重合体（Ａ１）の幹成分として、疎水性の（メタ）アクリレートモノマーと、親水性の（メタ）アクリレートモノマーと、マクロモノマーの末端の重合性官能基とがランダム共重合してなる共重合体成分を挙げることができる。 Moreover, it is preferable that the trunk component of the acrylic copolymer (A1) contains a hydrophobic (meth) acrylate monomer and a hydrophilic (meth) acrylate monomer as constituent units.
If the trunk component of the acrylic copolymer (A1) is composed only of a hydrophobic monomer, a tendency to wet-heat whitening is recognized. Therefore, it is preferable to introduce a hydrophilic monomer into the trunk component to prevent wet-heat whitening. .
Specifically, as the main component of the acrylic copolymer (A1), a hydrophobic (meth) acrylate monomer, a hydrophilic (meth) acrylate monomer, and a polymerizable functional group at the terminal of the macromonomer are included. The copolymer component formed by random copolymerization can be mentioned.
アクリル系共重合体（Ａ１）の幹成分が、疎水性モノマーのみから構成されると、湿熱白化する傾向が認められるため、親水性モノマーも幹成分に導入して湿熱白化を防止するのが好ましい。
具体的には、上記アクリル系共重合体（Ａ１）の幹成分として、疎水性の（メタ）アクリレートモノマーと、親水性の（メタ）アクリレートモノマーと、マクロモノマーの末端の重合性官能基とがランダム共重合してなる共重合体成分を挙げることができる。 Moreover, it is preferable that the trunk component of the acrylic copolymer (A1) contains a hydrophobic (meth) acrylate monomer and a hydrophilic (meth) acrylate monomer as constituent units.
If the trunk component of the acrylic copolymer (A1) is composed only of a hydrophobic monomer, a tendency to wet-heat whitening is recognized. Therefore, it is preferable to introduce a hydrophilic monomer into the trunk component to prevent wet-heat whitening. .
Specifically, as the main component of the acrylic copolymer (A1), a hydrophobic (meth) acrylate monomer, a hydrophilic (meth) acrylate monomer, and a polymerizable functional group at the terminal of the macromonomer are included. The copolymer component formed by random copolymerization can be mentioned.
ここで、上記の疎水性の（メタ）アクリレートモノマーとしては、例えばｎ－ブチル（メタ）アクリレート、イソブチル（メタ）アクリレート、ｓｅｃ－ブチル（メタ）アクリレート、ｔ－ブチル（メタ）アクリレート、ペンチル（メタ）アクリレート、イソペンチル（メタ）アクリレート、ネオペンチル（メタ）アクリレート、ヘキシル（メタ）アクリレート、シクロヘキシル（メタ）アクリレート、ヘプチル（メタ）アクリレート、２－エチルヘキシル（メタ）アクリレート、ｎ－オクチル（メタ）アクリート、イソオクチル（メタ）アクリレート、ノニル（メタ）アクリレート、イソノニル（メタ）アクリレート、ｔ－ブチルシクロヘキシル（メタ）アクリレート、デシル（メタ）アクリレート、イソデシル（メタ）アクリレート、ウンデシル（メタ）アクリレート、ラウリル（メタ）アクリレート、セチル（メタ）アクリレート、ステアリル（メタ）アクリレート、イソステアリル（メタ）アクリレート、ベヘニル（メタ）アクリレート、イソボルニル（メタ）アクリレート、シクロヘキシル（メタ）アクリレート、ジシクロペンテニルオキシエチル（メタ）アクリレ－ト、メチルメタクリレートを挙げる事ができる。
また、疎水性のビニルモノマーとしては酢酸ビニル、スチレン、ｔ－ブチルスチレン、α－メチルスチレン、ビニルトルエン、アルキルビニルモノマーなどを挙げることができる。 Here, examples of the hydrophobic (meth) acrylate monomer include n-butyl (meth) acrylate, isobutyl (meth) acrylate, sec-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) ) Acrylate, isopentyl (meth) acrylate, neopentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (Meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, t-butylcyclohexyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, urethane Decyl (meth) acrylate, lauryl (meth) acrylate, cetyl (meth) acrylate, stearyl (meth) acrylate, isostearyl (meth) acrylate, behenyl (meth) acrylate, isobornyl (meth) acrylate, cyclohexyl (meth) acrylate, di Mention may be made of cyclopentenyloxyethyl (meth) acrylate and methyl methacrylate.
Examples of the hydrophobic vinyl monomer include vinyl acetate, styrene, t-butyl styrene, α-methyl styrene, vinyl toluene, and alkyl vinyl monomers.
また、疎水性のビニルモノマーとしては酢酸ビニル、スチレン、ｔ－ブチルスチレン、α－メチルスチレン、ビニルトルエン、アルキルビニルモノマーなどを挙げることができる。 Here, examples of the hydrophobic (meth) acrylate monomer include n-butyl (meth) acrylate, isobutyl (meth) acrylate, sec-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) ) Acrylate, isopentyl (meth) acrylate, neopentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (Meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, t-butylcyclohexyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, urethane Decyl (meth) acrylate, lauryl (meth) acrylate, cetyl (meth) acrylate, stearyl (meth) acrylate, isostearyl (meth) acrylate, behenyl (meth) acrylate, isobornyl (meth) acrylate, cyclohexyl (meth) acrylate, di Mention may be made of cyclopentenyloxyethyl (meth) acrylate and methyl methacrylate.
Examples of the hydrophobic vinyl monomer include vinyl acetate, styrene, t-butyl styrene, α-methyl styrene, vinyl toluene, and alkyl vinyl monomers.
上記の親水性の（メタ）アクリレートモノマーとしては、例えばメチル（メタ）アクリレート、（メタ）アクリル酸、テトラヒドロフルフリル（メタ）アクリレートや、ヒドロキシエチル（メタ）アクリレート、ヒドロキシプロピル（メタ）アクリレート、ヒドロキシブチル（メタ）アクリレート、グリセロール（メタ）アクリレート等の水酸基含有（メタ）アクリレートや、（メタ）アクリル酸、２－（メタ）アクリロイルオキシエチルヘキサヒドロフタル酸、２－（メタ）アクリロイルオキシプロピルヘキサヒドロフタル酸、２－（メタ）アクリロイルオキシエチルフタル酸、２－（メタ）アクリロイルオキシプロピルフタル酸、２－（メタ）アクリロイルオキシエチルマレイン酸、２－（メタ）アクリロイルオキシプロピルマレイン酸、２－（メタ）アクリロイルオキシエチルコハク酸、２－（メタ）アクリロイルオキシプロピルコハク酸、クロトン酸、フマル酸、マレイン酸、イタコン酸、マレイン酸モノメチル、イタコン酸モノメチル等のカルボキシル基含有モノマー、無水マレイン酸、無水イタコン酸等の酸無水物基含有モノマー、（メタ）アクリル酸グリシジル、α－エチル（メタ）アクリル酸グリシジル、（メタ）アクリル酸３，４－エポキシブチル等のエポキシ基含有モノマー、メトキシポリエチレングリコール(メタ)アクリレート等のアルコキシポリアルキレングリコール（メタ）アクリレート、Ｎ，Ｎ－ジメチルアクリルアミド、ヒドロキシエチルアクリルアミド等などを挙げることができる。
Examples of the hydrophilic (meth) acrylate monomer include methyl (meth) acrylate, (meth) acrylic acid, tetrahydrofurfuryl (meth) acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxy Hydroxyl-containing (meth) acrylates such as butyl (meth) acrylate and glycerol (meth) acrylate, (meth) acrylic acid, 2- (meth) acryloyloxyethylhexahydrophthalic acid, 2- (meth) acryloyloxypropylhexahydro Phthalic acid, 2- (meth) acryloyloxyethyl phthalic acid, 2- (meth) acryloyloxypropyl phthalic acid, 2- (meth) acryloyloxyethyl maleic acid, 2- (meth) acryloyloxypropyl maleic acid Carboxyl group-containing monomers such as 2- (meth) acryloyloxyethyl succinic acid, 2- (meth) acryloyloxypropyl succinic acid, crotonic acid, fumaric acid, maleic acid, itaconic acid, monomethyl maleate, monomethyl itaconate, Monomers containing acid anhydride groups such as maleic acid and itaconic anhydride, monomers containing epoxy groups such as glycidyl (meth) acrylate, glycidyl α-ethyl (meth) acrylate, 3,4-epoxybutyl (meth) acrylate, Examples include alkoxypolyalkylene glycol (meth) acrylate such as methoxypolyethylene glycol (meth) acrylate, N, N-dimethylacrylamide, hydroxyethylacrylamide and the like.
（枝成分：マクロモノマー）
アクリル系共重合体（Ａ１）は、グラフト共重合体の枝成分として、マクロモノマーを導入し、マクロモノマー由来の繰り返し単位を含有することが重要である。
マクロモノマーとは、末端の重合性官能基と高分子量骨格成分とを有する高分子単量体である。 (Branch component: macromonomer)
It is important for the acrylic copolymer (A1) to introduce a macromonomer as a branch component of the graft copolymer and to contain a repeating unit derived from the macromonomer.
The macromonomer is a polymer monomer having a terminal polymerizable functional group and a high molecular weight skeleton component.
アクリル系共重合体（Ａ１）は、グラフト共重合体の枝成分として、マクロモノマーを導入し、マクロモノマー由来の繰り返し単位を含有することが重要である。
マクロモノマーとは、末端の重合性官能基と高分子量骨格成分とを有する高分子単量体である。 (Branch component: macromonomer)
It is important for the acrylic copolymer (A1) to introduce a macromonomer as a branch component of the graft copolymer and to contain a repeating unit derived from the macromonomer.
The macromonomer is a polymer monomer having a terminal polymerizable functional group and a high molecular weight skeleton component.
マクロモノマーのガラス転移温度（Ｔｇ）は、上記アクリル系共重合体（Ａ１）を構成する共重合体成分のガラス転移温度よりも高いことが好ましい。
具体的には、マクロモノマーのガラス転移温度（Ｔｇ）は、粘着剤組成物(I)の加熱溶融温度（ホットメルト温度）に影響するため、マクロモノマーのガラス転移温度（Ｔｇ）は３０℃～１２０℃であるのが好ましく、中でも４０℃以上或いは１１０℃以下、その中でも５０℃以上或いは１００℃以下であるのがさらに好ましい。
このようなガラス転移温度（Ｔｇ）であれば、分子量を調整することにより、優れた加工性や保管安定性を保持できると共に、８０℃付近でホットメルトするように調整することができる。
マクロモノマーのガラス転移温度とは、当該マクロモノマー自体のガラス転移温度をさし、示差走査熱量計（ＤＳＣ）で測定することができる。 The glass transition temperature (Tg) of the macromonomer is preferably higher than the glass transition temperature of the copolymer component constituting the acrylic copolymer (A1).
Specifically, since the glass transition temperature (Tg) of the macromonomer affects the heating and melting temperature (hot melt temperature) of the pressure-sensitive adhesive composition (I), the glass transition temperature (Tg) of the macromonomer is 30 ° C. to It is preferably 120 ° C., more preferably 40 ° C. or more and 110 ° C. or less, and particularly preferably 50 ° C. or more or 100 ° C. or less.
With such a glass transition temperature (Tg), by adjusting the molecular weight, it is possible to maintain excellent processability and storage stability, and to adjust so as to hot-melt near 80 ° C.
The glass transition temperature of the macromonomer refers to the glass transition temperature of the macromonomer itself, and can be measured with a differential scanning calorimeter (DSC).
具体的には、マクロモノマーのガラス転移温度（Ｔｇ）は、粘着剤組成物(I)の加熱溶融温度（ホットメルト温度）に影響するため、マクロモノマーのガラス転移温度（Ｔｇ）は３０℃～１２０℃であるのが好ましく、中でも４０℃以上或いは１１０℃以下、その中でも５０℃以上或いは１００℃以下であるのがさらに好ましい。
このようなガラス転移温度（Ｔｇ）であれば、分子量を調整することにより、優れた加工性や保管安定性を保持できると共に、８０℃付近でホットメルトするように調整することができる。
マクロモノマーのガラス転移温度とは、当該マクロモノマー自体のガラス転移温度をさし、示差走査熱量計（ＤＳＣ）で測定することができる。 The glass transition temperature (Tg) of the macromonomer is preferably higher than the glass transition temperature of the copolymer component constituting the acrylic copolymer (A1).
Specifically, since the glass transition temperature (Tg) of the macromonomer affects the heating and melting temperature (hot melt temperature) of the pressure-sensitive adhesive composition (I), the glass transition temperature (Tg) of the macromonomer is 30 ° C. to It is preferably 120 ° C., more preferably 40 ° C. or more and 110 ° C. or less, and particularly preferably 50 ° C. or more or 100 ° C. or less.
With such a glass transition temperature (Tg), by adjusting the molecular weight, it is possible to maintain excellent processability and storage stability, and to adjust so as to hot-melt near 80 ° C.
The glass transition temperature of the macromonomer refers to the glass transition temperature of the macromonomer itself, and can be measured with a differential scanning calorimeter (DSC).
また、室温状態では、枝成分同士が引き寄せ合って粘着剤組成物として物理的架橋をしたような状態を維持することができ、しかも、適度な温度に加熱することで前記物理的架橋が解れて流動性を得ることができるようにするためには、マクロモノマーの分子量や含有量を調整することも好ましいことである。
かかる観点から、マクロモノマーは、アクリル系共重合体（Ａ１）中に５質量％～３０質量％の割合で含有することが好ましく、中でも６質量％以上或いは２５質量％以下、その中でも８質量％以上或いは２０質量％以下であるのが好ましい。
また、マクロモノマーの数平均分子量は５００以上８０００未満であることが好ましく、中でも８００以上７５００未満、その中でも１０００以上７０００未満であるのが好ましい。
マクロモノマーは、一般に製造されているもの（例えば、東亜合成社製マクロモノマーなど）を適宜使用することができる。 Further, at room temperature, the branch components are attracted to each other and can maintain a state where they are physically cross-linked as a pressure-sensitive adhesive composition, and the physical cross-linking is released by heating to an appropriate temperature. In order to obtain fluidity, it is also preferable to adjust the molecular weight and content of the macromonomer.
From this viewpoint, the macromonomer is preferably contained in the acrylic copolymer (A1) in a proportion of 5% by mass to 30% by mass, particularly 6% by mass or 25% by mass, and more preferably 8% by mass. It is preferable that the amount is 20% by mass or more.
The number average molecular weight of the macromonomer is preferably 500 or more and less than 8000, more preferably 800 or more and less than 7500, and particularly preferably 1000 or more and less than 7000.
As the macromonomer, a generally produced one (for example, a macromonomer manufactured by Toa Gosei Co., Ltd.) can be appropriately used.
かかる観点から、マクロモノマーは、アクリル系共重合体（Ａ１）中に５質量％～３０質量％の割合で含有することが好ましく、中でも６質量％以上或いは２５質量％以下、その中でも８質量％以上或いは２０質量％以下であるのが好ましい。
また、マクロモノマーの数平均分子量は５００以上８０００未満であることが好ましく、中でも８００以上７５００未満、その中でも１０００以上７０００未満であるのが好ましい。
マクロモノマーは、一般に製造されているもの（例えば、東亜合成社製マクロモノマーなど）を適宜使用することができる。 Further, at room temperature, the branch components are attracted to each other and can maintain a state where they are physically cross-linked as a pressure-sensitive adhesive composition, and the physical cross-linking is released by heating to an appropriate temperature. In order to obtain fluidity, it is also preferable to adjust the molecular weight and content of the macromonomer.
From this viewpoint, the macromonomer is preferably contained in the acrylic copolymer (A1) in a proportion of 5% by mass to 30% by mass, particularly 6% by mass or 25% by mass, and more preferably 8% by mass. It is preferable that the amount is 20% by mass or more.
The number average molecular weight of the macromonomer is preferably 500 or more and less than 8000, more preferably 800 or more and less than 7500, and particularly preferably 1000 or more and less than 7000.
As the macromonomer, a generally produced one (for example, a macromonomer manufactured by Toa Gosei Co., Ltd.) can be appropriately used.
マクロモノマーの高分子量骨格成分は、アクリル系重合体またはビニル系重合体から構成されるのが好ましい。
前記マクロモノマーの高分子量骨格成分としては、例えば、メチル（メタ）アクリレート、エチル（メタ）アクリレート、プロピル（メタ）アクリレート、イソプロピル（メタ）アクリレート、ｎ－ブチル（メタ）アクリレート、イソブチル（メタ）アクリレート、ｓｅｃ－ブチル（メタ）アクリレート、ｔ－ブチル（メタ）アクリレート、ペンチル（メタ）アクリレート、イソペンチル（メタ）アクリレート、ネオペンチル（メタ）アクリレート、ヘキシル（メタ）アクリレート、シクロヘキシル（メタ）アクリレート、ヘプチル（メタ）アクリレート、２－エチルヘキシル（メタ）アクリレート、ｎ－オクチル（メタ）アクリート、イソオクチル（メタ）アクリレート、ノニル（メタ）アクリレート、イソノニル（メタ）アクリレート、ｔ－ブチルシクロヘキシル（メタ）アクリレート、デシル（メタ）アクリレート、イソデシル（メタ）アクリレート、ウンデシル（メタ）アクリレート、ラウリル（メタ）アクリレート、セチル（メタ）アクリレート、ステアリル（メタ）アクリレート、イソステアリル（メタ）アクリレート、ベヘニル（メタ）アクリレート、イソボルニル（メタ）アクリレート、２－フェノキシエチル（メタ）アクリレート、３，５，５－トリメチルシクロヘキサン（メタ）アクリレート、ｐ－クミルフェノールＥＯ変性（メタ）アクリレート、ジシクロペンタニル（メタ）アクリレート、ジシクロペンテニル（メタ）アクリレート、ジシクロペンテニルオキシエチル（メタ）アクリレート、ベンジル（メタ）アクリレート、ヒドロキシアルキル（メタ）アクリレート、（メタ）アクリル酸、グリシジル（メタ）アクリレート、（メタ）アクリルアミド、Ｎ、Ｎ－ジメチル（メタ）アクリルアミド、（メタ）アクリルニトリル、アルコキシアルキル（メタ）アクリレート、アルコキシポリアルキレングリコール（メタ）アクリレート等の（メタ）アクリレートモノマーや、スチレン、ｔ－ブチルスチレン、α－メチルスチレン、ビニルトルエン、アルキルビニルモノマー、酢酸ビニル、アルキルビニルエーテル、ヒドロキシアルキルビニルエーテル等の各種ビニルモノマーが挙げられ、これらは単独で又は２種類以上を組み合わせて使用することができる。 The high molecular weight skeleton component of the macromonomer is preferably composed of an acrylic polymer or a vinyl polymer.
Examples of the high molecular weight skeleton component of the macromonomer include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, and isobutyl (meth) acrylate. , Sec-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, isopentyl (meth) acrylate, neopentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, heptyl (meth) ) Acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, -Butylcyclohexyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, lauryl (meth) acrylate, cetyl (meth) acrylate, stearyl (meth) acrylate, isostearyl (meth) acrylate , Behenyl (meth) acrylate, isobornyl (meth) acrylate, 2-phenoxyethyl (meth) acrylate, 3,5,5-trimethylcyclohexane (meth) acrylate, p-cumylphenol EO modified (meth) acrylate, dicyclopenta Nyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, benzyl (meth) acrylate, hydroxyalkyl (meth) Chrylate, (meth) acrylic acid, glycidyl (meth) acrylate, (meth) acrylamide, N, N-dimethyl (meth) acrylamide, (meth) acrylonitrile, alkoxyalkyl (meth) acrylate, alkoxy polyalkylene glycol (meth) acrylate (Meth) acrylate monomers such as styrene, t-butyl styrene, α-methyl styrene, vinyl toluene, alkyl vinyl monomers, vinyl acetate, alkyl vinyl ethers, hydroxyalkyl vinyl ethers, and various other vinyl monomers. Alternatively, two or more types can be used in combination.
前記マクロモノマーの高分子量骨格成分としては、例えば、メチル（メタ）アクリレート、エチル（メタ）アクリレート、プロピル（メタ）アクリレート、イソプロピル（メタ）アクリレート、ｎ－ブチル（メタ）アクリレート、イソブチル（メタ）アクリレート、ｓｅｃ－ブチル（メタ）アクリレート、ｔ－ブチル（メタ）アクリレート、ペンチル（メタ）アクリレート、イソペンチル（メタ）アクリレート、ネオペンチル（メタ）アクリレート、ヘキシル（メタ）アクリレート、シクロヘキシル（メタ）アクリレート、ヘプチル（メタ）アクリレート、２－エチルヘキシル（メタ）アクリレート、ｎ－オクチル（メタ）アクリート、イソオクチル（メタ）アクリレート、ノニル（メタ）アクリレート、イソノニル（メタ）アクリレート、ｔ－ブチルシクロヘキシル（メタ）アクリレート、デシル（メタ）アクリレート、イソデシル（メタ）アクリレート、ウンデシル（メタ）アクリレート、ラウリル（メタ）アクリレート、セチル（メタ）アクリレート、ステアリル（メタ）アクリレート、イソステアリル（メタ）アクリレート、ベヘニル（メタ）アクリレート、イソボルニル（メタ）アクリレート、２－フェノキシエチル（メタ）アクリレート、３，５，５－トリメチルシクロヘキサン（メタ）アクリレート、ｐ－クミルフェノールＥＯ変性（メタ）アクリレート、ジシクロペンタニル（メタ）アクリレート、ジシクロペンテニル（メタ）アクリレート、ジシクロペンテニルオキシエチル（メタ）アクリレート、ベンジル（メタ）アクリレート、ヒドロキシアルキル（メタ）アクリレート、（メタ）アクリル酸、グリシジル（メタ）アクリレート、（メタ）アクリルアミド、Ｎ、Ｎ－ジメチル（メタ）アクリルアミド、（メタ）アクリルニトリル、アルコキシアルキル（メタ）アクリレート、アルコキシポリアルキレングリコール（メタ）アクリレート等の（メタ）アクリレートモノマーや、スチレン、ｔ－ブチルスチレン、α－メチルスチレン、ビニルトルエン、アルキルビニルモノマー、酢酸ビニル、アルキルビニルエーテル、ヒドロキシアルキルビニルエーテル等の各種ビニルモノマーが挙げられ、これらは単独で又は２種類以上を組み合わせて使用することができる。 The high molecular weight skeleton component of the macromonomer is preferably composed of an acrylic polymer or a vinyl polymer.
Examples of the high molecular weight skeleton component of the macromonomer include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, and isobutyl (meth) acrylate. , Sec-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, isopentyl (meth) acrylate, neopentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, heptyl (meth) ) Acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, -Butylcyclohexyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, lauryl (meth) acrylate, cetyl (meth) acrylate, stearyl (meth) acrylate, isostearyl (meth) acrylate , Behenyl (meth) acrylate, isobornyl (meth) acrylate, 2-phenoxyethyl (meth) acrylate, 3,5,5-trimethylcyclohexane (meth) acrylate, p-cumylphenol EO modified (meth) acrylate, dicyclopenta Nyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, benzyl (meth) acrylate, hydroxyalkyl (meth) Chrylate, (meth) acrylic acid, glycidyl (meth) acrylate, (meth) acrylamide, N, N-dimethyl (meth) acrylamide, (meth) acrylonitrile, alkoxyalkyl (meth) acrylate, alkoxy polyalkylene glycol (meth) acrylate (Meth) acrylate monomers such as styrene, t-butyl styrene, α-methyl styrene, vinyl toluene, alkyl vinyl monomers, vinyl acetate, alkyl vinyl ethers, hydroxyalkyl vinyl ethers, and various other vinyl monomers. Alternatively, two or more types can be used in combination.
前記マクロモノマーの末端重合性官能基としては、例えば、メタクリロイル基、アクリロイル基、ビニル基などを挙げることができる。
Examples of the terminal polymerizable functional group of the macromonomer include a methacryloyl group, an acryloyl group, and a vinyl group.
（アクリル系共重合体（Ａ１）の物性）
前記アクリル系共重合体（Ａ１）は、温度１３０℃、周波数０．０２Ｈｚにおける複素粘度が１００～８００Ｐａ・ｓであることが好ましく、１５０～７００Ｐａ・ｓがより好ましく、１７０～６００Ｐａ・ｓがさらに好ましい。
前記アクリル系共重合体（Ａ１）の温度１３０℃における複素粘度は、当該透明両面粘着材をホットメルトさせて使用するときの粘着剤組成物(I)の流動性に影響するため、かかる複素粘度が１００～８００Ｐａ・ｓであれば、優れたホットメルト適性を持たせることができる。 (Physical properties of acrylic copolymer (A1))
The acrylic copolymer (A1) preferably has a complex viscosity of 100 to 800 Pa · s, more preferably 150 to 700 Pa · s, more preferably 170 to 600 Pa · s at a temperature of 130 ° C. and a frequency of 0.02 Hz. preferable.
The complex viscosity at a temperature of 130 ° C. of the acrylic copolymer (A1) affects the fluidity of the pressure-sensitive adhesive composition (I) when the transparent double-sided pressure-sensitive adhesive material is used by hot-melting. Is 100 to 800 Pa · s, excellent hot melt suitability can be obtained.
前記アクリル系共重合体（Ａ１）は、温度１３０℃、周波数０．０２Ｈｚにおける複素粘度が１００～８００Ｐａ・ｓであることが好ましく、１５０～７００Ｐａ・ｓがより好ましく、１７０～６００Ｐａ・ｓがさらに好ましい。
前記アクリル系共重合体（Ａ１）の温度１３０℃における複素粘度は、当該透明両面粘着材をホットメルトさせて使用するときの粘着剤組成物(I)の流動性に影響するため、かかる複素粘度が１００～８００Ｐａ・ｓであれば、優れたホットメルト適性を持たせることができる。 (Physical properties of acrylic copolymer (A1))
The acrylic copolymer (A1) preferably has a complex viscosity of 100 to 800 Pa · s, more preferably 150 to 700 Pa · s, more preferably 170 to 600 Pa · s at a temperature of 130 ° C. and a frequency of 0.02 Hz. preferable.
The complex viscosity at a temperature of 130 ° C. of the acrylic copolymer (A1) affects the fluidity of the pressure-sensitive adhesive composition (I) when the transparent double-sided pressure-sensitive adhesive material is used by hot-melting. Is 100 to 800 Pa · s, excellent hot melt suitability can be obtained.
前記アクリル系共重合体（Ａ１）の複素粘度を前記範囲に調整するには、例えばアクリル系共重合体（Ａ１）の重量平均分子量や、アクリル系共重合体（Ａ１）の幹成分を構成する共重合体成分のガラス転移温度を調整することが挙げられる。
アクリル系共重合体（Ａ１）の重量平均分子量としては、好ましくは５万～５０万、中でも１２万以上或いは４５万以下であるのが好ましく、その中でも１５万以上或いは４０万以下であるのがより好ましい。
また、アクリル系共重合体（Ａ１）の幹成分を構成する共重合体成分のガラス転移温度としては、好ましくは－７０℃～０℃、中でも－６５℃以上或いは－５℃以下、その中でも－６０℃以上或いは－１０℃以下に調整すると共に、当該共重合体成分の分子量を調整して粘弾性を調整する方法を挙げることができる。但し、この方法に限定するものではない。 In order to adjust the complex viscosity of the acrylic copolymer (A1) to the above range, for example, the weight average molecular weight of the acrylic copolymer (A1) or the trunk component of the acrylic copolymer (A1) is configured. Examples include adjusting the glass transition temperature of the copolymer component.
The weight average molecular weight of the acrylic copolymer (A1) is preferably 50,000 to 500,000, preferably 120,000 or more and 450,000 or less, and more preferably 150,000 or more and 400,000 or less. More preferred.
The glass transition temperature of the copolymer component constituting the backbone component of the acrylic copolymer (A1) is preferably −70 ° C. to 0 ° C., more preferably −65 ° C. or higher, or −5 ° C. or lower, especially Examples thereof include a method of adjusting viscoelasticity by adjusting the molecular weight of the copolymer component while adjusting the temperature to 60 ° C. or higher or −10 ° C. or lower. However, it is not limited to this method.
アクリル系共重合体（Ａ１）の重量平均分子量としては、好ましくは５万～５０万、中でも１２万以上或いは４５万以下であるのが好ましく、その中でも１５万以上或いは４０万以下であるのがより好ましい。
また、アクリル系共重合体（Ａ１）の幹成分を構成する共重合体成分のガラス転移温度としては、好ましくは－７０℃～０℃、中でも－６５℃以上或いは－５℃以下、その中でも－６０℃以上或いは－１０℃以下に調整すると共に、当該共重合体成分の分子量を調整して粘弾性を調整する方法を挙げることができる。但し、この方法に限定するものではない。 In order to adjust the complex viscosity of the acrylic copolymer (A1) to the above range, for example, the weight average molecular weight of the acrylic copolymer (A1) or the trunk component of the acrylic copolymer (A1) is configured. Examples include adjusting the glass transition temperature of the copolymer component.
The weight average molecular weight of the acrylic copolymer (A1) is preferably 50,000 to 500,000, preferably 120,000 or more and 450,000 or less, and more preferably 150,000 or more and 400,000 or less. More preferred.
The glass transition temperature of the copolymer component constituting the backbone component of the acrylic copolymer (A1) is preferably −70 ° C. to 0 ° C., more preferably −65 ° C. or higher, or −5 ° C. or lower, especially Examples thereof include a method of adjusting viscoelasticity by adjusting the molecular weight of the copolymer component while adjusting the temperature to 60 ° C. or higher or −10 ° C. or lower. However, it is not limited to this method.
（架橋剤（Ｂ１））
架橋剤（Ｂ１）としては、例えばエポキシ架橋剤やイソシアネート架橋剤、オキセタン化合物、シラン化合物、アクリル化合物等からなる架橋剤を適宜選択可能である。中でも、反応性や得られる硬化物の強度の点で、（メタ）アクリロイル基を２個以上、中でも３個以上有する多官能（メタ）アクリレートが好ましい。 (Crosslinking agent (B1))
As the crosslinking agent (B1), for example, an epoxy crosslinking agent, an isocyanate crosslinking agent, an oxetane compound, a silane compound, an acrylic compound, or the like can be appropriately selected. Of these, polyfunctional (meth) acrylates having two or more (meth) acryloyl groups, particularly three or more, are preferred in terms of reactivity and the strength of the resulting cured product.
架橋剤（Ｂ１）としては、例えばエポキシ架橋剤やイソシアネート架橋剤、オキセタン化合物、シラン化合物、アクリル化合物等からなる架橋剤を適宜選択可能である。中でも、反応性や得られる硬化物の強度の点で、（メタ）アクリロイル基を２個以上、中でも３個以上有する多官能（メタ）アクリレートが好ましい。 (Crosslinking agent (B1))
As the crosslinking agent (B1), for example, an epoxy crosslinking agent, an isocyanate crosslinking agent, an oxetane compound, a silane compound, an acrylic compound, or the like can be appropriately selected. Of these, polyfunctional (meth) acrylates having two or more (meth) acryloyl groups, particularly three or more, are preferred in terms of reactivity and the strength of the resulting cured product.
画像表示装置構成部材を貼合一体化させた後、架橋剤（Ｂ１）を粘着材中で架橋することで、当該シートはホットメルト性を失う代わりに、高温環境下における高い凝集力を発現し、優れた耐発泡信頼性を得ることができる。
After the image display device constituent members are bonded and integrated, the cross-linking agent (B1) is cross-linked in the adhesive material, so that the sheet exhibits high cohesive force in a high temperature environment instead of losing hot melt properties. Excellent foaming reliability can be obtained.
このような多官能（メタ）アクリレートとしては、例えば１，４－ブタンジオールジ（メタ）アクリレート、ネオペンチルグリコールジ（メタ）アクリレート、グリセリンジ（メタ）アクリレート、グリセリングリシジルエーテルジ（メタ）アクリレート、１，６－ヘキサンジオールジ（メタ）アクリレート、１，９－ノナンジオールジ（メタ）アクリレート、トリシクロデカンジメタノールジ（メタ）アクリレート、ビスフェノールＡポリエトキシジ（メタ）アクリレート、ビスフェノールＡポリアルコキシジ（メタ）アクリレート、ビスフェノールＦポリアルコキシジ（メタ）アクリレート、ポリアルキレングリコールジ（メタ）アクリレート、トリメチロールプロパントリオキシエチル（メタ）アクリレート、ε-カプロラクトン変性トリス（２－ヒドロキシエチル）イソシアヌレートトリ（メタ）アクリレート、ペンタエリスリトールトリ（メタ）アクリレート、アルコキシ化ペンタエリスリトールトリ（メタ）アクリレート、ペンタエリスリトールテトラ（メタ）アクリレート、アルコキシ化ペンタエリスリトールテトラ（メタ）アクリレート、ジペンタエリスリトールヘキサ（メタ）アクリレート、アルコキシ化ジペンタエリスリトールヘキサ（メタ）アクリレート、ポリアルキレングリコールジ（メタ）アクリレート、トリス（アクリロキシエチル）イソシアヌレート、ジペンタエリスリトールペンタ（メタ）アクリレート、アルコキシ化ジペンタエリスリトールペンタ（メタ）アクリレート、トリペンタエリスリトールヘキサ（メタ）アクリレート、トリペンタエリスリトールペンタ（メタ）アクリレート、ヒドロキシビバリン酸ネオペンチルグリコールジ（メタ）アクリレート、ヒドロキシビバリン酸ネオペングリコールのε－カプロラクトン付加物のジ（メタ）アクリレート、トリメチロールプロパントリ（メタ）アクリレート、アルコキシ化トリメチロールプロパントリ（メタ）アクリレート、ジトリメチロールプロパンテトラ（メタ）アクリレート等の紫外線硬化型の多官能モノマー類のほか、ポリエステル（メタ）アクリレート、エポキシ（メタ）アクリレート、ウレタン（メタ）アクリレート、ポリエーテル（メタ）アクリレート等の多官能アクリルオリゴマー類を挙げることができる。
Examples of such polyfunctional (meth) acrylates include 1,4-butanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, glycerin di (meth) acrylate, glycerin glycidyl ether di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, bisphenol A polyethoxydi (meth) acrylate, bisphenol A polyalkoxydi (meth) ) Acrylate, bisphenol F polyalkoxydi (meth) acrylate, polyalkylene glycol di (meth) acrylate, trimethylolpropane trioxyethyl (meth) acrylate, ε-caprolactone modified Lith (2-hydroxyethyl) isocyanurate tri (meth) acrylate, pentaerythritol tri (meth) acrylate, alkoxylated pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, alkoxylated pentaerythritol tetra (meth) acrylate , Dipentaerythritol hexa (meth) acrylate, alkoxylated dipentaerythritol hexa (meth) acrylate, polyalkylene glycol di (meth) acrylate, tris (acryloxyethyl) isocyanurate, dipentaerythritol penta (meth) acrylate, alkoxylation Dipentaerythritol penta (meth) acrylate, tripentaerythritol hexa (meth) acrylate, tripentae Sitolitol penta (meth) acrylate, hydroxypentaglycol neopentyl glycol di (meth) acrylate, ε-caprolactone adduct of hydroxybivalate neopentglycol, di (meth) acrylate, trimethylolpropane tri (meth) acrylate, In addition to UV-curable polyfunctional monomers such as alkoxylated trimethylolpropane tri (meth) acrylate and ditrimethylolpropane tetra (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, urethane (meth) acrylate, Mention may be made of polyfunctional acrylic oligomers such as polyether (meth) acrylate.
上記に挙げた中でも、被着体への密着性や湿熱白化抑制の効果を向上させる観点から、水酸基等の極性官能基を含有する多官能モノマーもしくはオリゴマーが、好ましい。
その中でも、水酸基を有する多官能（メタ）アクリル酸エステルを用いるのが好ましい。
よって、湿熱白化を防止する観点からは、前記アクリル系共重合体（Ａ１）、すなわちグラフト共重合体の幹成分として、疎水性のアクリレートモノマーと、親水性のアクリレートモノマーとを含有するのが好ましく、さらには、架橋剤（Ｂ）として、水酸基を有する多官能（メタ）アクリル酸エステルを用いるのが好ましい。 Among the examples mentioned above, a polyfunctional monomer or oligomer containing a polar functional group such as a hydroxyl group is preferable from the viewpoint of improving the adhesion to the adherend and the effect of suppressing the heat and whitening.
Among these, it is preferable to use polyfunctional (meth) acrylic acid ester having a hydroxyl group.
Therefore, from the viewpoint of preventing wet heat whitening, it is preferable to contain a hydrophobic acrylate monomer and a hydrophilic acrylate monomer as a backbone component of the acrylic copolymer (A1), that is, the graft copolymer. Furthermore, it is preferable to use a polyfunctional (meth) acrylic acid ester having a hydroxyl group as the crosslinking agent (B).
その中でも、水酸基を有する多官能（メタ）アクリル酸エステルを用いるのが好ましい。
よって、湿熱白化を防止する観点からは、前記アクリル系共重合体（Ａ１）、すなわちグラフト共重合体の幹成分として、疎水性のアクリレートモノマーと、親水性のアクリレートモノマーとを含有するのが好ましく、さらには、架橋剤（Ｂ）として、水酸基を有する多官能（メタ）アクリル酸エステルを用いるのが好ましい。 Among the examples mentioned above, a polyfunctional monomer or oligomer containing a polar functional group such as a hydroxyl group is preferable from the viewpoint of improving the adhesion to the adherend and the effect of suppressing the heat and whitening.
Among these, it is preferable to use polyfunctional (meth) acrylic acid ester having a hydroxyl group.
Therefore, from the viewpoint of preventing wet heat whitening, it is preferable to contain a hydrophobic acrylate monomer and a hydrophilic acrylate monomer as a backbone component of the acrylic copolymer (A1), that is, the graft copolymer. Furthermore, it is preferable to use a polyfunctional (meth) acrylic acid ester having a hydroxyl group as the crosslinking agent (B).
架橋剤（Ｂ１）の含有量は、特に制限されるものではない。目安としては、アクリル系共重合体（Ａ１）１００質量部に対して０．５～２０質量部、中でも１質量部以上或いは１５質量部以下、その中でも２質量部以上或いは１０質量部以下の割合であるのが好ましい。
架橋剤（Ｂ１）を上記範囲で含有することで、未架橋状態における本粘着シートの形状安定性と、架橋後の粘着材における耐発泡信頼性とを両立させることができる。但し、他の要素とのバランスでこの範囲を超えてもよい。 The content of the crosslinking agent (B1) is not particularly limited. As a guideline, the ratio of 0.5 to 20 parts by weight, especially 1 part by weight or more and 15 parts by weight or less, especially 2 parts by weight or more or 10 parts by weight or less, relative to 100 parts by weight of the acrylic copolymer (A1). Is preferred.
By containing a crosslinking agent (B1) in the said range, the shape stability of this pressure-sensitive adhesive sheet in an uncrosslinked state and the foaming reliability in the pressure-sensitive adhesive material after crosslinking can be made compatible. However, this range may be exceeded in balance with other elements.
架橋剤（Ｂ１）を上記範囲で含有することで、未架橋状態における本粘着シートの形状安定性と、架橋後の粘着材における耐発泡信頼性とを両立させることができる。但し、他の要素とのバランスでこの範囲を超えてもよい。 The content of the crosslinking agent (B1) is not particularly limited. As a guideline, the ratio of 0.5 to 20 parts by weight, especially 1 part by weight or more and 15 parts by weight or less, especially 2 parts by weight or more or 10 parts by weight or less, relative to 100 parts by weight of the acrylic copolymer (A1). Is preferred.
By containing a crosslinking agent (B1) in the said range, the shape stability of this pressure-sensitive adhesive sheet in an uncrosslinked state and the foaming reliability in the pressure-sensitive adhesive material after crosslinking can be made compatible. However, this range may be exceeded in balance with other elements.
（光重合開始剤（Ｃ１））
光重合開始剤（Ｃ１）は、前述の架橋剤（Ｂ１）の架橋反応における反応開始助剤としての機能を果たすものであって、前述の光重合開始剤（Ｃ）に係る記載のものを適宜使用することができる。 (Photopolymerization initiator (C1))
The photopolymerization initiator (C1) serves as a reaction initiation assistant in the cross-linking reaction of the above-described cross-linking agent (B1), and those described in the photo-polymerization initiator (C) are appropriately used. Can be used.
光重合開始剤（Ｃ１）は、前述の架橋剤（Ｂ１）の架橋反応における反応開始助剤としての機能を果たすものであって、前述の光重合開始剤（Ｃ）に係る記載のものを適宜使用することができる。 (Photopolymerization initiator (C1))
The photopolymerization initiator (C1) serves as a reaction initiation assistant in the cross-linking reaction of the above-described cross-linking agent (B1), and those described in the photo-polymerization initiator (C) are appropriately used. Can be used.
光重合開始剤（Ｃ１）の含有量は特に制限されるものではない。目安としては、アクリル系共重合体（Ａ１）１００質量部に対して０．１～１０質量部、中でも０．５質量部以上或いは５質量部以下、その中でも１質量部以上或いは３質量部以下の割合で含有するのが好ましい。
光重合開始剤（Ｃ１）の含有量を上記範囲とすることで、活性エネルギー線に対する適度な反応感度を得ることができる。 The content of the photopolymerization initiator (C1) is not particularly limited. As a guideline, 0.1 to 10 parts by weight, especially 0.5 parts by weight or more and 5 parts by weight or less, and 1 part by weight or more or 3 parts by weight or less based on 100 parts by weight of the acrylic copolymer (A1). It is preferable to contain in the ratio.
By setting the content of the photopolymerization initiator (C1) in the above range, an appropriate reaction sensitivity with respect to the active energy ray can be obtained.
光重合開始剤（Ｃ１）の含有量を上記範囲とすることで、活性エネルギー線に対する適度な反応感度を得ることができる。 The content of the photopolymerization initiator (C1) is not particularly limited. As a guideline, 0.1 to 10 parts by weight, especially 0.5 parts by weight or more and 5 parts by weight or less, and 1 part by weight or more or 3 parts by weight or less based on 100 parts by weight of the acrylic copolymer (A1). It is preferable to contain in the ratio.
By setting the content of the photopolymerization initiator (C1) in the above range, an appropriate reaction sensitivity with respect to the active energy ray can be obtained.
（波長変換剤（Ｄ１））
波長変換剤（Ｄ１）は、印刷隠蔽部など光が届き難い箇所の光硬化反応を促進させる機能を果たすものであって、前述の波長変換剤（Ｄ）に係る記載のものを適宜使用することができる。
波長変換剤（Ｄ１）の含有量は特に制限されるものではないが、アクリル系共重合体（Ａ１）１００質量部に対して、０．００１～２質量部、中でも０．００２質量部以上或いは１．５質量部以下、その中でも０．００４質量部以上或いは１質量部以下の割合で含有するのが好ましい。 (Wavelength conversion agent (D1))
The wavelength converting agent (D1) fulfills the function of promoting the photocuring reaction in places where it is difficult for light to reach, such as the printing concealment part, and the one described in the above-mentioned wavelength converting agent (D) should be used as appropriate. Can do.
The content of the wavelength converting agent (D1) is not particularly limited, but is 0.001 to 2 parts by mass, especially 0.002 parts by mass or more with respect to 100 parts by mass of the acrylic copolymer (A1). The content is preferably 1.5 parts by mass or less, and more preferably 0.004 parts by mass or more or 1 part by mass or less.
波長変換剤（Ｄ１）は、印刷隠蔽部など光が届き難い箇所の光硬化反応を促進させる機能を果たすものであって、前述の波長変換剤（Ｄ）に係る記載のものを適宜使用することができる。
波長変換剤（Ｄ１）の含有量は特に制限されるものではないが、アクリル系共重合体（Ａ１）１００質量部に対して、０．００１～２質量部、中でも０．００２質量部以上或いは１．５質量部以下、その中でも０．００４質量部以上或いは１質量部以下の割合で含有するのが好ましい。 (Wavelength conversion agent (D1))
The wavelength converting agent (D1) fulfills the function of promoting the photocuring reaction in places where it is difficult for light to reach, such as the printing concealment part, and the one described in the above-mentioned wavelength converting agent (D) should be used as appropriate. Can do.
The content of the wavelength converting agent (D1) is not particularly limited, but is 0.001 to 2 parts by mass, especially 0.002 parts by mass or more with respect to 100 parts by mass of the acrylic copolymer (A1). The content is preferably 1.5 parts by mass or less, and more preferably 0.004 parts by mass or more or 1 part by mass or less.
（その他の成分）
粘着剤組成物(I)は、上記以外の成分として、通常の粘着剤組成物に配合されている公知の成分を含有してもよい。例えば、必要に応じて、粘着付与樹脂や、酸化防止剤、光安定化剤、紫外線吸収剤、金属不活性化剤、防錆剤、老化防止剤、吸湿剤、発泡剤、消泡剤、無機粒子、粘度調整剤などの各種の添加剤を適宜含有させることが可能である。
また、必要に応じて反応触媒（三級アミン系化合物、四級アンモニウム系化合物、ラウリル酸スズ化合物など）を適宜含有してもよい。 (Other ingredients)
The pressure-sensitive adhesive composition (I) may contain known components blended in a normal pressure-sensitive adhesive composition as components other than those described above. For example, if necessary, tackifier resins, antioxidants, light stabilizers, UV absorbers, metal deactivators, rust inhibitors, anti-aging agents, hygroscopic agents, foaming agents, antifoaming agents, inorganic Various additives such as particles and viscosity modifiers can be contained as appropriate.
Moreover, you may contain reaction catalyst (A tertiary amine type compound, a quaternary ammonium type compound, a lauric acid tin compound, etc.) suitably as needed.
粘着剤組成物(I)は、上記以外の成分として、通常の粘着剤組成物に配合されている公知の成分を含有してもよい。例えば、必要に応じて、粘着付与樹脂や、酸化防止剤、光安定化剤、紫外線吸収剤、金属不活性化剤、防錆剤、老化防止剤、吸湿剤、発泡剤、消泡剤、無機粒子、粘度調整剤などの各種の添加剤を適宜含有させることが可能である。
また、必要に応じて反応触媒（三級アミン系化合物、四級アンモニウム系化合物、ラウリル酸スズ化合物など）を適宜含有してもよい。 (Other ingredients)
The pressure-sensitive adhesive composition (I) may contain known components blended in a normal pressure-sensitive adhesive composition as components other than those described above. For example, if necessary, tackifier resins, antioxidants, light stabilizers, UV absorbers, metal deactivators, rust inhibitors, anti-aging agents, hygroscopic agents, foaming agents, antifoaming agents, inorganic Various additives such as particles and viscosity modifiers can be contained as appropriate.
Moreover, you may contain reaction catalyst (A tertiary amine type compound, a quaternary ammonium type compound, a lauric acid tin compound, etc.) suitably as needed.
＜粘着剤組成物(II)＞
粘着剤組成物(II)として、ガラス転移温度（Ｔｇ）が０℃未満のモノマーａと、ガラス転移温度（Ｔｇ）が０℃以上８０℃未満のモノマーｂと、ガラス転移温度（Ｔｇ）が８０℃以上のモノマーｃとが、ａ：ｂ：ｃ＝１０～４０：９０～３５：０～２５のモル比率で共重合してなり、重量平均分子量５００００～４０００００の（メタ）アクリル酸エステル共重合体もしくはビニル共重合体を含有するベースポリマー（Ａ２）と、架橋剤（Ｂ２）と、光重合開始剤（Ｃ２）と、波長変換剤（Ｄ２）とを含有する樹脂組成物を挙げることができる。 <Adhesive composition (II)>
As the pressure-sensitive adhesive composition (II), a monomer a having a glass transition temperature (Tg) of less than 0 ° C., a monomer b having a glass transition temperature (Tg) of from 0 ° C. to less than 80 ° C., and a glass transition temperature (Tg) of 80 (Meth) acrylic acid ester copolymer having a weight average molecular weight of 50,000 to 400,000, which is copolymerized with a monomer c having a weight ratio of a: b: c = 10 to 40:90 to 35: 0 to 25 A resin composition containing a base polymer (A2) containing a coalescence or vinyl copolymer, a crosslinking agent (B2), a photopolymerization initiator (C2), and a wavelength conversion agent (D2) can be mentioned. .
粘着剤組成物(II)として、ガラス転移温度（Ｔｇ）が０℃未満のモノマーａと、ガラス転移温度（Ｔｇ）が０℃以上８０℃未満のモノマーｂと、ガラス転移温度（Ｔｇ）が８０℃以上のモノマーｃとが、ａ：ｂ：ｃ＝１０～４０：９０～３５：０～２５のモル比率で共重合してなり、重量平均分子量５００００～４０００００の（メタ）アクリル酸エステル共重合体もしくはビニル共重合体を含有するベースポリマー（Ａ２）と、架橋剤（Ｂ２）と、光重合開始剤（Ｃ２）と、波長変換剤（Ｄ２）とを含有する樹脂組成物を挙げることができる。 <Adhesive composition (II)>
As the pressure-sensitive adhesive composition (II), a monomer a having a glass transition temperature (Tg) of less than 0 ° C., a monomer b having a glass transition temperature (Tg) of from 0 ° C. to less than 80 ° C., and a glass transition temperature (Tg) of 80 (Meth) acrylic acid ester copolymer having a weight average molecular weight of 50,000 to 400,000, which is copolymerized with a monomer c having a weight ratio of a: b: c = 10 to 40:90 to 35: 0 to 25 A resin composition containing a base polymer (A2) containing a coalescence or vinyl copolymer, a crosslinking agent (B2), a photopolymerization initiator (C2), and a wavelength conversion agent (D2) can be mentioned. .
なお、ベースポリマーとは、粘着剤組成物(II)の主成分を為す樹脂の意味である。具体的な含有量を規定するものではないが、目安としては、粘着剤組成物(II)に含まれる樹脂の５０質量％以上、中でも８０質量％以上、その中でも９０質量％以上（１００質量％を含む）を占める樹脂である（なお、ベースポリマーが２種類以上の場合は、それらの合計量が前記含有量に該当する。）。
The base polymer means a resin that forms the main component of the pressure-sensitive adhesive composition (II). Although the specific content is not specified, as a guideline, as a guideline, the resin contained in the pressure-sensitive adhesive composition (II) is 50% by mass or more, particularly 80% by mass or more, and more preferably 90% by mass or more (100% by mass). (In the case where there are two or more types of base polymers, the total amount thereof corresponds to the content).
（ベースポリマー（Ａ２））
ベースポリマー（Ａ２）は、（メタ）アクリル酸エステル共重合体もしくはビニル共重合体であるのが好ましい。 (Base polymer (A2))
The base polymer (A2) is preferably a (meth) acrylic acid ester copolymer or a vinyl copolymer.
ベースポリマー（Ａ２）は、（メタ）アクリル酸エステル共重合体もしくはビニル共重合体であるのが好ましい。 (Base polymer (A2))
The base polymer (A2) is preferably a (meth) acrylic acid ester copolymer or a vinyl copolymer.
上記（メタ）アクリル酸エステル共重合体もしくはビニル共重合体は、室温状態での形状保持性とホットメルト性とを両立させる観点から、重量平均分子量は５００００～４０００００であるのが好ましく、中でも６００００以上或いは３５００００以下、その中でも７００００以上或いは３０００００以下であるのがさらに好ましい。
The above (meth) acrylic acid ester copolymer or vinyl copolymer preferably has a weight average molecular weight of 50,000 to 400,000 from the viewpoint of achieving both shape retention at room temperature and hot melt properties. It is more preferably 350,000 or less, more preferably 70000 or more or 300000 or less.
アクリル酸エステル系共重合体は、これを調整するために用いるアクリルモノマーやメタクリルモノマーの種類、組成比率、さらには重合条件等を適宜選択することによって、ガラス転移温度（Ｔｇ）や分子量等の物性を適宜調整することが可能である。
この際、アクリル酸エステル共重合体を構成するアクリルモノマーとしては、例えば、２－エチルヘキシルアクリレート、ｎ－オクチルアクリート、イソオクチルアクリレート、ｎ－ブチルアクリレート、エチルアクリレート等を主原料として挙げることができる。
これらの他に、凝集力付与や極性付与等の目的に応じて、さまざまな官能基を有する（メタ）アクリルモノマーを上記アクリルモノマーと共重合させてもよい。
当該官能基を有する（メタ）アクリルモノマーとしては、例えばメチルメタクリレート、メチルアクリレート、ヒドロキシエチルアクリレート、アクリル酸、グリシジルアクリレート、Ｎ－置換アクリルアミド、アクリロニトリル、メタクリロニトリル、含フッ素アルキルアクリレート、オルガノシロキシ基含有アクリレートなどを挙げることができる。 Acrylic acid ester-based copolymers have physical properties such as glass transition temperature (Tg) and molecular weight by appropriately selecting the types, composition ratios, and polymerization conditions of acrylic monomers and methacrylic monomers used to adjust them. Can be adjusted as appropriate.
In this case, examples of the acrylic monomer constituting the acrylic ester copolymer include 2-ethylhexyl acrylate, n-octyl acrylate, isooctyl acrylate, n-butyl acrylate, ethyl acrylate, and the like as main raw materials.
In addition to these, a (meth) acrylic monomer having various functional groups may be copolymerized with the acrylic monomer according to the purpose of imparting cohesive force or imparting polarity.
Examples of the (meth) acrylic monomer having a functional group include methyl methacrylate, methyl acrylate, hydroxyethyl acrylate, acrylic acid, glycidyl acrylate, N-substituted acrylamide, acrylonitrile, methacrylonitrile, fluorine-containing alkyl acrylate, and organosiloxy group An acrylate etc. can be mentioned.
この際、アクリル酸エステル共重合体を構成するアクリルモノマーとしては、例えば、２－エチルヘキシルアクリレート、ｎ－オクチルアクリート、イソオクチルアクリレート、ｎ－ブチルアクリレート、エチルアクリレート等を主原料として挙げることができる。
これらの他に、凝集力付与や極性付与等の目的に応じて、さまざまな官能基を有する（メタ）アクリルモノマーを上記アクリルモノマーと共重合させてもよい。
当該官能基を有する（メタ）アクリルモノマーとしては、例えばメチルメタクリレート、メチルアクリレート、ヒドロキシエチルアクリレート、アクリル酸、グリシジルアクリレート、Ｎ－置換アクリルアミド、アクリロニトリル、メタクリロニトリル、含フッ素アルキルアクリレート、オルガノシロキシ基含有アクリレートなどを挙げることができる。 Acrylic acid ester-based copolymers have physical properties such as glass transition temperature (Tg) and molecular weight by appropriately selecting the types, composition ratios, and polymerization conditions of acrylic monomers and methacrylic monomers used to adjust them. Can be adjusted as appropriate.
In this case, examples of the acrylic monomer constituting the acrylic ester copolymer include 2-ethylhexyl acrylate, n-octyl acrylate, isooctyl acrylate, n-butyl acrylate, ethyl acrylate, and the like as main raw materials.
In addition to these, a (meth) acrylic monomer having various functional groups may be copolymerized with the acrylic monomer according to the purpose of imparting cohesive force or imparting polarity.
Examples of the (meth) acrylic monomer having a functional group include methyl methacrylate, methyl acrylate, hydroxyethyl acrylate, acrylic acid, glycidyl acrylate, N-substituted acrylamide, acrylonitrile, methacrylonitrile, fluorine-containing alkyl acrylate, and organosiloxy group An acrylate etc. can be mentioned.
他方、ビニル共重合体としては、上記アクリルモノマーやメタクリルモノマーと共重合可能な酢酸ビニルや、アルキルビニルエーテル、ヒドロキシアルキルビニルエーテル等の各種ビニルモノマーも適宜重合してなるビニル共重合体を挙げることができる。
On the other hand, examples of the vinyl copolymer include vinyl copolymers obtained by appropriately polymerizing vinyl acetate copolymerizable with the above acrylic monomer and methacrylic monomer, and various vinyl monomers such as alkyl vinyl ether and hydroxyalkyl vinyl ether. .
本粘着シートのベースポリマー（Ａ２）としては、ガラス転移温度（Ｔｇ）が０℃未満のモノマーａと、ガラス転移温度（Ｔｇ）が０℃以上８０℃未満のモノマーｂと、ガラス転移温度（Ｔｇ）が８０℃以上のモノマーｃとが、ａ：ｂ：ｃ＝１０～４０：９０～３５：０～２５のモル比率で共重合してなる（メタ）アクリル酸エステル共重合体もしくはビニル共重合体であるのが好ましい。
この際、モノマーａ、ｂ及びｃの各ガラス転移温度（Ｔｇ）は、当該モノマーからポリマーを作製した際（ホモポリマー化）の各ガラス転移温度（Ｔｇ）の意味である。 As a base polymer (A2) of this pressure-sensitive adhesive sheet, a monomer a having a glass transition temperature (Tg) of less than 0 ° C., a monomer b having a glass transition temperature (Tg) of from 0 ° C. to less than 80 ° C., and a glass transition temperature (Tg) ) Is a monomer (c) of 80 ° C. or higher and a (meth) acrylic acid ester copolymer or vinyl copolymer produced by copolymerization at a molar ratio of a: b: c = 10 to 40:90 to 35: 0 to 25 It is preferably a coalescence.
At this time, the glass transition temperatures (Tg) of the monomers a, b and c are the meanings of the glass transition temperatures (Tg) when a polymer is produced from the monomers (homopolymerization).
この際、モノマーａ、ｂ及びｃの各ガラス転移温度（Ｔｇ）は、当該モノマーからポリマーを作製した際（ホモポリマー化）の各ガラス転移温度（Ｔｇ）の意味である。 As a base polymer (A2) of this pressure-sensitive adhesive sheet, a monomer a having a glass transition temperature (Tg) of less than 0 ° C., a monomer b having a glass transition temperature (Tg) of from 0 ° C. to less than 80 ° C., and a glass transition temperature (Tg) ) Is a monomer (c) of 80 ° C. or higher and a (meth) acrylic acid ester copolymer or vinyl copolymer produced by copolymerization at a molar ratio of a: b: c = 10 to 40:90 to 35: 0 to 25 It is preferably a coalescence.
At this time, the glass transition temperatures (Tg) of the monomers a, b and c are the meanings of the glass transition temperatures (Tg) when a polymer is produced from the monomers (homopolymerization).
前記モノマーａは、例えば炭素数４以上の側鎖を有するアルキル基構造をもつ（メタ）アクリル酸エステルモノマーであるのが好ましい。
この際、炭素数４以上の側鎖は、直鎖からなるものであっても、分岐した炭素鎖からなるものであってもよい。
より具体的には、前記モノマーａは、炭素数４～１０の直鎖アルキル基構造をもつ（メタ）アクリル酸エステルモノマーであるか、或いは、炭素数６～１８の分岐アルキル基構造をもつ（メタ）アクリル酸エステルモノマーであるのが好ましい。 The monomer a is preferably a (meth) acrylic acid ester monomer having an alkyl group structure having a side chain having 4 or more carbon atoms, for example.
In this case, the side chain having 4 or more carbon atoms may be a straight chain or a branched carbon chain.
More specifically, the monomer a is a (meth) acrylic acid ester monomer having a linear alkyl group structure having 4 to 10 carbon atoms, or a branched alkyl group structure having 6 to 18 carbon atoms ( It is preferably a (meth) acrylic acid ester monomer.
この際、炭素数４以上の側鎖は、直鎖からなるものであっても、分岐した炭素鎖からなるものであってもよい。
より具体的には、前記モノマーａは、炭素数４～１０の直鎖アルキル基構造をもつ（メタ）アクリル酸エステルモノマーであるか、或いは、炭素数６～１８の分岐アルキル基構造をもつ（メタ）アクリル酸エステルモノマーであるのが好ましい。 The monomer a is preferably a (meth) acrylic acid ester monomer having an alkyl group structure having a side chain having 4 or more carbon atoms, for example.
In this case, the side chain having 4 or more carbon atoms may be a straight chain or a branched carbon chain.
More specifically, the monomer a is a (meth) acrylic acid ester monomer having a linear alkyl group structure having 4 to 10 carbon atoms, or a branched alkyl group structure having 6 to 18 carbon atoms ( It is preferably a (meth) acrylic acid ester monomer.
ここで、「炭素数４～１０の直鎖アルキル基構造をもつ（メタ）アクリル酸エステルモノマー」としては、ｎ－ブチル（メタ）アクリレート、ｎ－ヘキシル（メタ）アクリレート、ｎ－オクチル（メタ）アクリレート、ｎ－ノニル（メタ）アクリレート、ｎ－デシル（メタ）アクリレートなどを挙げることができる。
他方、「炭素数６～１８の分岐アルキル基構造をもつ（メタ）アクリル酸エステルモノマー」としては、２－エチルヘキシル（メタ）アクリレート、２－メチルヘキシル（メタ）アクリレート、イソオクチル（メタ）アクリレート、イソノニル（メタ）アクリレート、イソデシル（メタ）アクリレート、イソステアリル（メタ）アクリレートなどを挙げることができる。 Here, “(meth) acrylic acid ester monomer having a linear alkyl group structure having 4 to 10 carbon atoms” includes n-butyl (meth) acrylate, n-hexyl (meth) acrylate, and n-octyl (meth). Examples thereof include acrylate, n-nonyl (meth) acrylate, and n-decyl (meth) acrylate.
On the other hand, “(meth) acrylic acid ester monomer having a branched alkyl group structure having 6 to 18 carbon atoms” includes 2-ethylhexyl (meth) acrylate, 2-methylhexyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (Meth) acrylate, isodecyl (meth) acrylate, isostearyl (meth) acrylate, etc. can be mentioned.
他方、「炭素数６～１８の分岐アルキル基構造をもつ（メタ）アクリル酸エステルモノマー」としては、２－エチルヘキシル（メタ）アクリレート、２－メチルヘキシル（メタ）アクリレート、イソオクチル（メタ）アクリレート、イソノニル（メタ）アクリレート、イソデシル（メタ）アクリレート、イソステアリル（メタ）アクリレートなどを挙げることができる。 Here, “(meth) acrylic acid ester monomer having a linear alkyl group structure having 4 to 10 carbon atoms” includes n-butyl (meth) acrylate, n-hexyl (meth) acrylate, and n-octyl (meth). Examples thereof include acrylate, n-nonyl (meth) acrylate, and n-decyl (meth) acrylate.
On the other hand, “(meth) acrylic acid ester monomer having a branched alkyl group structure having 6 to 18 carbon atoms” includes 2-ethylhexyl (meth) acrylate, 2-methylhexyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (Meth) acrylate, isodecyl (meth) acrylate, isostearyl (meth) acrylate, etc. can be mentioned.
前記モノマーｂは、炭素数４以下の（メタ）アクリル酸エステルモノマー、側鎖に環状骨格を有する（メタ）アクリル酸エステルモノマー、炭素数４以下のビニルモノマー、又は、側鎖に環状骨格を有するビニルモノマーであるのが好ましい。
中でも、上記モノマーｂは、側鎖の炭素数が４以下のビニルモノマーであるのが特に好ましい。 The monomer b has a (meth) acrylic acid ester monomer having 4 or less carbon atoms, a (meth) acrylic acid ester monomer having a cyclic skeleton in the side chain, a vinyl monomer having 4 or less carbon atoms, or a cyclic skeleton in the side chain. A vinyl monomer is preferred.
Among these, the monomer b is particularly preferably a vinyl monomer having 4 or less carbon atoms in the side chain.
中でも、上記モノマーｂは、側鎖の炭素数が４以下のビニルモノマーであるのが特に好ましい。 The monomer b has a (meth) acrylic acid ester monomer having 4 or less carbon atoms, a (meth) acrylic acid ester monomer having a cyclic skeleton in the side chain, a vinyl monomer having 4 or less carbon atoms, or a cyclic skeleton in the side chain. A vinyl monomer is preferred.
Among these, the monomer b is particularly preferably a vinyl monomer having 4 or less carbon atoms in the side chain.
ここで、「炭素数４以下の（メタ）アクリル酸エステルモノマー」としては、メチル（メタ）アクリレート、エチル（メタ）アクリレート、ｎ－プロピル（メタ）アクリレート、ｎ－プロピル（メタ）アクリレート、イソプロピル（メタ）アクリレート、ｎ－ブチル（メタ）アクリート、t－ブチル（メタ）アクリレート、イソブチル（メタ）アクリレートなどを挙げることができる。
「側鎖に環状骨格を有する（メタ）アクリル酸エステルモノマー」としては、イソボルニル（メタ）アクリレート、シクロヘキシル（メタ）アクリレート、１，４－シクロヘキサンジメタノールモノ（メタ）アクリレート、テトラヒドロフルフリル（メタ）アクリレート、ベンジル（メタ）アクリレート、フェノキシエチル（メタ）アクリレート、２－ヒドロキシ－３－フェノキシプロピル（メタ）アクリレート、３，３，５－トリメチルシクロヘキサノール（メタ）アクリレート、環状トリメチロールプロパンフォルマル（メタ）アクリレート、４－エトキシ化クミルフェノール（メタ）アクリレート、ジシクロペンテニルオキシエチル（メタ）アクリレ－トジシクロペンテニル（メタ）アクリレ－トなどを挙げることができる。
「炭素数４以下のビニルモノマー」としては、酢酸ビニル、プロピオン酸ビニル、酪酸ビニル、ｎ－プロピルビニルエーテル、イソプロピルビニルエーテル、ｎ－ブチルビニルエーテル、イソブチルビニルエーテルなどを挙げることができる。
「側鎖に環状骨格を有するビニルモノマー」としては、スチレン、シクロヘキシルビニルエーテル、ノルボルニルビニルエーテル、ノルボルネニルビニルエーテルなどを挙げることができる。中でも、側鎖の炭素数が４以下であるビニルモノマー、または側鎖の炭素数が４以下であるアクリル酸エステルモノマーが特に好適である。 Here, as the “(meth) acrylic acid ester monomer having 4 or less carbon atoms”, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl ( Examples thereof include meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) acrylate, and isobutyl (meth) acrylate.
Examples of “(meth) acrylic acid ester monomers having a cyclic skeleton in the side chain” include isobornyl (meth) acrylate, cyclohexyl (meth) acrylate, 1,4-cyclohexanedimethanol mono (meth) acrylate, tetrahydrofurfuryl (meth) Acrylate, benzyl (meth) acrylate, phenoxyethyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, 3,3,5-trimethylcyclohexanol (meth) acrylate, cyclic trimethylolpropane formal (meta ) Acrylate, 4-ethoxylated cumylphenol (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate dicyclopentenyl (meth) acrylate, and the like.
Examples of the “vinyl monomer having 4 or less carbon atoms” include vinyl acetate, vinyl propionate, vinyl butyrate, n-propyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether, isobutyl vinyl ether and the like.
Examples of the “vinyl monomer having a cyclic skeleton in the side chain” include styrene, cyclohexyl vinyl ether, norbornyl vinyl ether, norbornenyl vinyl ether and the like. Among these, a vinyl monomer having 4 or less carbon atoms in the side chain or an acrylate monomer having 4 or less carbon atoms in the side chain is particularly suitable.
「側鎖に環状骨格を有する（メタ）アクリル酸エステルモノマー」としては、イソボルニル（メタ）アクリレート、シクロヘキシル（メタ）アクリレート、１，４－シクロヘキサンジメタノールモノ（メタ）アクリレート、テトラヒドロフルフリル（メタ）アクリレート、ベンジル（メタ）アクリレート、フェノキシエチル（メタ）アクリレート、２－ヒドロキシ－３－フェノキシプロピル（メタ）アクリレート、３，３，５－トリメチルシクロヘキサノール（メタ）アクリレート、環状トリメチロールプロパンフォルマル（メタ）アクリレート、４－エトキシ化クミルフェノール（メタ）アクリレート、ジシクロペンテニルオキシエチル（メタ）アクリレ－トジシクロペンテニル（メタ）アクリレ－トなどを挙げることができる。
「炭素数４以下のビニルモノマー」としては、酢酸ビニル、プロピオン酸ビニル、酪酸ビニル、ｎ－プロピルビニルエーテル、イソプロピルビニルエーテル、ｎ－ブチルビニルエーテル、イソブチルビニルエーテルなどを挙げることができる。
「側鎖に環状骨格を有するビニルモノマー」としては、スチレン、シクロヘキシルビニルエーテル、ノルボルニルビニルエーテル、ノルボルネニルビニルエーテルなどを挙げることができる。中でも、側鎖の炭素数が４以下であるビニルモノマー、または側鎖の炭素数が４以下であるアクリル酸エステルモノマーが特に好適である。 Here, as the “(meth) acrylic acid ester monomer having 4 or less carbon atoms”, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl ( Examples thereof include meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) acrylate, and isobutyl (meth) acrylate.
Examples of “(meth) acrylic acid ester monomers having a cyclic skeleton in the side chain” include isobornyl (meth) acrylate, cyclohexyl (meth) acrylate, 1,4-cyclohexanedimethanol mono (meth) acrylate, tetrahydrofurfuryl (meth) Acrylate, benzyl (meth) acrylate, phenoxyethyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, 3,3,5-trimethylcyclohexanol (meth) acrylate, cyclic trimethylolpropane formal (meta ) Acrylate, 4-ethoxylated cumylphenol (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate dicyclopentenyl (meth) acrylate, and the like.
Examples of the “vinyl monomer having 4 or less carbon atoms” include vinyl acetate, vinyl propionate, vinyl butyrate, n-propyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether, isobutyl vinyl ether and the like.
Examples of the “vinyl monomer having a cyclic skeleton in the side chain” include styrene, cyclohexyl vinyl ether, norbornyl vinyl ether, norbornenyl vinyl ether and the like. Among these, a vinyl monomer having 4 or less carbon atoms in the side chain or an acrylate monomer having 4 or less carbon atoms in the side chain is particularly suitable.
前記モノマーｃは、側鎖の炭素数が１以下である（メタ）アクリル酸エステルモノマー、又は、側鎖に環状骨格を有する（メタ）アクリル酸エステルモノマーであるのが好ましい。
ここで、「側鎖の炭素数が１以下である（メタ）アクリル酸エステルモノマー」としては、メチルメタクリレート、アクリル酸、メタクリル酸などを挙げることができる。
「側鎖に環状骨格を有する（メタ）アクリル酸エステルモノマー」としては、イソボルニルメタクリレート、３，３，５－トリメチルシクロヘキシルメタクリレート、ジシクロペンタニルアクリレ－ト、ジシクロペンタニルメタクリレート、ジシクロペンテニルメタクリレ－トなどを挙げることができる。 The monomer c is preferably a (meth) acrylic acid ester monomer having a side chain having 1 or less carbon atoms, or a (meth) acrylic acid ester monomer having a cyclic skeleton in the side chain.
Here, examples of the “(meth) acrylic acid ester monomer having a side chain having 1 or less carbon atoms” include methyl methacrylate, acrylic acid, and methacrylic acid.
Examples of the (meth) acrylate monomer having a cyclic skeleton in the side chain include isobornyl methacrylate, 3,3,5-trimethylcyclohexyl methacrylate, dicyclopentanyl acrylate, dicyclopentanyl methacrylate, And cyclopentenyl methacrylate.
ここで、「側鎖の炭素数が１以下である（メタ）アクリル酸エステルモノマー」としては、メチルメタクリレート、アクリル酸、メタクリル酸などを挙げることができる。
「側鎖に環状骨格を有する（メタ）アクリル酸エステルモノマー」としては、イソボルニルメタクリレート、３，３，５－トリメチルシクロヘキシルメタクリレート、ジシクロペンタニルアクリレ－ト、ジシクロペンタニルメタクリレート、ジシクロペンテニルメタクリレ－トなどを挙げることができる。 The monomer c is preferably a (meth) acrylic acid ester monomer having a side chain having 1 or less carbon atoms, or a (meth) acrylic acid ester monomer having a cyclic skeleton in the side chain.
Here, examples of the “(meth) acrylic acid ester monomer having a side chain having 1 or less carbon atoms” include methyl methacrylate, acrylic acid, and methacrylic acid.
Examples of the (meth) acrylate monomer having a cyclic skeleton in the side chain include isobornyl methacrylate, 3,3,5-trimethylcyclohexyl methacrylate, dicyclopentanyl acrylate, dicyclopentanyl methacrylate, And cyclopentenyl methacrylate.
ベースポリマー（Ａ２）が、モノマーａと、モノマーｂと、モノマーｃとが、ａ：ｂ：ｃ＝１０～４０：９０～３５：０～２５のモル比率で共重合してなる（メタ）アクリル酸エステル共重合体もしくはビニル共重合体を含んでいれば、Ｔａｎδのピークを０～２０℃に調整することができ、通常状態、すなわち、室温状態において、シート状の形状を保持することができる。しかも、剥離可能な程度の接着性（“タック性”と称する）を発現させることができる。また、ホットメルト可能な温度に加熱すると、流動性を発現するようになり、貼合面の段差部に追従して隅々まで充填することができる。
よって、かかる観点から、ベースポリマー（Ａ２）を構成する（メタ）アクリル酸エステル共重合体もしくはビニル共重合体におけるモノマーａと、モノマーｂと、モノマーｃとのモル比率は、ａ：ｂ：ｃ＝１０～４０：９０～３５：０～２５であるのが好ましく、中でも１３～４０：８７～３５：０～２３、その中でも１５～４０：８５～３８：２～２０であるのが好ましい。
また、上記と同様の観点から、ベースポリマー（Ａ２）を構成する（メタ）アクリル酸エステル共重合体もしくはビニル共重合体におけるモノマーａと、モノマーｂと、モノマーｃとのモル比率は、ｂ＞ａ＞ｃであるのが好ましい。 The base polymer (A2) is a (meth) acryl obtained by copolymerizing the monomer a, the monomer b, and the monomer c at a molar ratio of a: b: c = 10 to 40:90 to 35: 0 to 25 If an acid ester copolymer or a vinyl copolymer is included, the Tan δ peak can be adjusted to 0 to 20 ° C., and a sheet-like shape can be maintained in a normal state, that is, a room temperature state. . In addition, it is possible to develop a peelable adhesiveness (referred to as “tackiness”). Moreover, when it heats to the temperature which can be hot-melted, fluidity will be expressed and it can be filled to every corner following the level | step-difference part of a bonding surface.
Therefore, from this viewpoint, the molar ratio of the monomer a, the monomer b, and the monomer c in the (meth) acrylic acid ester copolymer or vinyl copolymer constituting the base polymer (A2) is a: b: c = 10 to 40:90 to 35: 0 to 25, preferably 13 to 40:87 to 35: 0 to 23, and more preferably 15 to 40:85 to 38: 2 to 20.
From the same viewpoint as described above, the molar ratio of the monomer a, the monomer b, and the monomer c in the (meth) acrylic acid ester copolymer or vinyl copolymer constituting the base polymer (A2) is b> It is preferable that a> c.
よって、かかる観点から、ベースポリマー（Ａ２）を構成する（メタ）アクリル酸エステル共重合体もしくはビニル共重合体におけるモノマーａと、モノマーｂと、モノマーｃとのモル比率は、ａ：ｂ：ｃ＝１０～４０：９０～３５：０～２５であるのが好ましく、中でも１３～４０：８７～３５：０～２３、その中でも１５～４０：８５～３８：２～２０であるのが好ましい。
また、上記と同様の観点から、ベースポリマー（Ａ２）を構成する（メタ）アクリル酸エステル共重合体もしくはビニル共重合体におけるモノマーａと、モノマーｂと、モノマーｃとのモル比率は、ｂ＞ａ＞ｃであるのが好ましい。 The base polymer (A2) is a (meth) acryl obtained by copolymerizing the monomer a, the monomer b, and the monomer c at a molar ratio of a: b: c = 10 to 40:90 to 35: 0 to 25 If an acid ester copolymer or a vinyl copolymer is included, the Tan δ peak can be adjusted to 0 to 20 ° C., and a sheet-like shape can be maintained in a normal state, that is, a room temperature state. . In addition, it is possible to develop a peelable adhesiveness (referred to as “tackiness”). Moreover, when it heats to the temperature which can be hot-melted, fluidity will be expressed and it can be filled to every corner following the level | step-difference part of a bonding surface.
Therefore, from this viewpoint, the molar ratio of the monomer a, the monomer b, and the monomer c in the (meth) acrylic acid ester copolymer or vinyl copolymer constituting the base polymer (A2) is a: b: c = 10 to 40:90 to 35: 0 to 25, preferably 13 to 40:87 to 35: 0 to 23, and more preferably 15 to 40:85 to 38: 2 to 20.
From the same viewpoint as described above, the molar ratio of the monomer a, the monomer b, and the monomer c in the (meth) acrylic acid ester copolymer or vinyl copolymer constituting the base polymer (A2) is b> It is preferable that a> c.
（架橋剤（Ｂ２））
本粘着シート中で架橋剤（Ｂ２）が架橋することで、本粘着シートは、高温環境下における高い凝集力を発現し、優れた耐発泡信頼性を得ることができる。 (Crosslinking agent (B2))
When the crosslinking agent (B2) is crosslinked in the pressure-sensitive adhesive sheet, the pressure-sensitive adhesive sheet exhibits a high cohesive force in a high-temperature environment and can obtain excellent foaming reliability.
本粘着シート中で架橋剤（Ｂ２）が架橋することで、本粘着シートは、高温環境下における高い凝集力を発現し、優れた耐発泡信頼性を得ることができる。 (Crosslinking agent (B2))
When the crosslinking agent (B2) is crosslinked in the pressure-sensitive adhesive sheet, the pressure-sensitive adhesive sheet exhibits a high cohesive force in a high-temperature environment and can obtain excellent foaming reliability.
このような架橋剤（Ｂ２）としては、例えばエポキシ架橋剤やイソシアネート架橋剤、オキセタン化合物、シラン化合物、アクリル化合物等からなる架橋剤を適宜選択可能である。中でも、反応性や得られる硬化物の強度の点で、（メタ）アクリロイル基を２個以上、中でも３個以上有する多官能（メタ）アクリレートが好ましい。
As such a crosslinking agent (B2), for example, a crosslinking agent comprising an epoxy crosslinking agent, an isocyanate crosslinking agent, an oxetane compound, a silane compound, an acrylic compound, or the like can be appropriately selected. Of these, polyfunctional (meth) acrylates having two or more (meth) acryloyl groups, particularly three or more, are preferred in terms of reactivity and the strength of the resulting cured product.
このような多官能（メタ）アクリレートとしては、例えば１，４－ブタンジオールジ（メタ）アクリレート、ネオペンチルグリコールジ（メタ）アクリレート、グリセリンジ（メタ）アクリレート、グリセリングリシジルエーテルジ（メタ）アクリレート、１，６－ヘキサンジオールジ（メタ）アクリレート、１，９－ノナンジオールジ（メタ）アクリレート、トリシクロデカンジメタノールジ（メタ）アクリレート、ビスフェノールＡポリエトキシジ（メタ）アクリレート、ビスフェノールＡポリアルコキシジ（メタ）アクリレート、ビスフェノールＦポリアルコキシジ（メタ）アクリレート、ポリアルキレングリコールジ（メタ）アクリレート、トリメチロールプロパントリオキシエチル（メタ）アクリレート、ε－カプロラクトン変性トリス（２－ヒドロキシエチル）イソシアヌレートトリ（メタ）アクリレート、ペンタエリスリトールトリ（メタ）アクリレート、アルコキシ化ペンタエリスリトールトリ（メタ）アクリレート、ペンタエリスリトールテトラ（メタ）アクリレート、アルコキシ化ペンタエリスリトールテトラ（メタ）アクリレート、ジペンタエリスリトールヘキサ（メタ）アクリレート、アルコキシ化ジペンタエリスリトールヘキサ（メタ）アクリレート、ポリアルキレングリコールジ（メタ）アクリレート、トリス（アクリロキシエチル）イソシアヌレート、ジペンタエリスリトールペンタ（メタ）アクリレート、アルコキシ化ジペンタエリスリトールペンタ（メタ）アクリレート、トリペンタエリスリトールヘキサ（メタ）アクリレート、トリペンタエリスリトールペンタ（メタ）アクリレート、ヒドロキシビバリン酸ネオペンチルグリコールジ（メタ）アクリレート、ヒドロキシビバリン酸ネオペングリコールのε－カプロラクトン付加物のジ（メタ）アクリレート、トリメチロールプロパントリ（メタ）アクリレート、アルコキシ化トリメチロールプロパントリ（メタ）アクリレート、ジトリメチロールプロパンテトラ（メタ）アクリレート等の紫外線硬化型の多官能モノマー類のほか、ポリエステル（メタ）アクリレート、エポキシ（メタ）アクリレート、ウレタン（メタ）アクリレート、ポリエーテル（メタ）アクリレート等の多官能アクリルオリゴマー類を挙げることができる。
Examples of such polyfunctional (meth) acrylates include 1,4-butanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, glycerin di (meth) acrylate, glycerin glycidyl ether di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, bisphenol A polyethoxydi (meth) acrylate, bisphenol A polyalkoxydi (meth) ) Acrylate, bisphenol F polyalkoxy di (meth) acrylate, polyalkylene glycol di (meth) acrylate, trimethylolpropane trioxyethyl (meth) acrylate, ε-caprolactone modification Tris (2-hydroxyethyl) isocyanurate tri (meth) acrylate, pentaerythritol tri (meth) acrylate, alkoxylated pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, alkoxylated pentaerythritol tetra (meth) acrylate , Dipentaerythritol hexa (meth) acrylate, alkoxylated dipentaerythritol hexa (meth) acrylate, polyalkylene glycol di (meth) acrylate, tris (acryloxyethyl) isocyanurate, dipentaerythritol penta (meth) acrylate, alkoxylation Dipentaerythritol penta (meth) acrylate, tripentaerythritol hexa (meth) acrylate, tripentae Rithritol penta (meth) acrylate, hydroxybivalate neopentyl glycol di (meth) acrylate, di (meth) acrylate of ε-caprolactone adduct of hydroxybivalate neopentglycol, trimethylolpropane tri (meth) acrylate, In addition to UV-curable polyfunctional monomers such as alkoxylated trimethylolpropane tri (meth) acrylate and ditrimethylolpropane tetra (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, urethane (meth) acrylate, Mention may be made of polyfunctional acrylic oligomers such as polyether (meth) acrylate.
上記に挙げた中でも、被着体への密着性や耐熱性、湿熱白化抑制の効果を向上させる観点から、極性官能基を含有する多官能モノマーもしくはオリゴマーが、好ましい。その中でも、イソシアヌル環骨格を有する多官能（メタ）アクリル酸エステルを用いるのが好ましい。
Among the above-mentioned examples, a polyfunctional monomer or oligomer containing a polar functional group is preferable from the viewpoint of improving adhesion to the adherend, heat resistance, and wet heat whitening suppression effect. Among these, it is preferable to use polyfunctional (meth) acrylic acid ester having an isocyanuric ring skeleton.
架橋剤（Ｂ２）の含有量は、特に制限されるものではない。目安としては、ベースポリマー（Ａ２）１００質量部に対して０．５～２０質量部、中でも１質量部以上或いは１５質量部以下、その中でも２質量部以上或いは１０質量部以下の割合であるのが好ましい。
架橋剤（Ｂ２）を上記範囲で含有することで、未架橋状態における本粘着シートの形状安定性と、架橋後の粘着シートにおける耐発泡信頼性とを両立させることができる。但し、他の要素とのバランスでこの範囲を超えてもよい。 The content of the crosslinking agent (B2) is not particularly limited. As a guideline, the ratio is 0.5 to 20 parts by mass, particularly 1 to 15 parts by mass, especially 2 to 10 parts by mass with respect to 100 parts by mass of the base polymer (A2). Is preferred.
By containing the crosslinking agent (B2) in the above range, both the shape stability of the present pressure-sensitive adhesive sheet in an uncrosslinked state and the anti-foaming reliability of the pressure-sensitive adhesive sheet after crosslinking can be achieved. However, this range may be exceeded in balance with other elements.
架橋剤（Ｂ２）を上記範囲で含有することで、未架橋状態における本粘着シートの形状安定性と、架橋後の粘着シートにおける耐発泡信頼性とを両立させることができる。但し、他の要素とのバランスでこの範囲を超えてもよい。 The content of the crosslinking agent (B2) is not particularly limited. As a guideline, the ratio is 0.5 to 20 parts by mass, particularly 1 to 15 parts by mass, especially 2 to 10 parts by mass with respect to 100 parts by mass of the base polymer (A2). Is preferred.
By containing the crosslinking agent (B2) in the above range, both the shape stability of the present pressure-sensitive adhesive sheet in an uncrosslinked state and the anti-foaming reliability of the pressure-sensitive adhesive sheet after crosslinking can be achieved. However, this range may be exceeded in balance with other elements.
（光重合開始剤（Ｃ２））
光重合開始剤（Ｃ２）は、前述の架橋剤（Ｂ２）の架橋反応における反応開始助剤としての機能を果たすものであって、前述の光重合開始剤（Ｃ）に係る記載のものを適宜使用することができる。 (Photopolymerization initiator (C2))
The photopolymerization initiator (C2) serves as a reaction initiation assistant in the cross-linking reaction of the above-described cross-linking agent (B2), and those described in the photo-polymerization initiator (C) are appropriately used. Can be used.
光重合開始剤（Ｃ２）は、前述の架橋剤（Ｂ２）の架橋反応における反応開始助剤としての機能を果たすものであって、前述の光重合開始剤（Ｃ）に係る記載のものを適宜使用することができる。 (Photopolymerization initiator (C2))
The photopolymerization initiator (C2) serves as a reaction initiation assistant in the cross-linking reaction of the above-described cross-linking agent (B2), and those described in the photo-polymerization initiator (C) are appropriately used. Can be used.
光重合開始剤（Ｃ２）の含有量は特に制限されるものではない。目安としては、ベースポリマー（Ａ２）１００質量部に対して０．１～１０質量部、中でも０．５質量部以上或いは５質量部以下、その中でも１質量部以上或いは３質量部以下の割合で含有するのが好ましい。
光重合開始剤（Ｃ２）の含有量を上記範囲とすることで、活性エネルギー線に対する適度な反応感度を得ることができる。 The content of the photopolymerization initiator (C2) is not particularly limited. As a standard, 0.1 to 10 parts by weight with respect to 100 parts by weight of the base polymer (A2), especially 0.5 parts by weight or more and 5 parts by weight or less, and more preferably 1 part by weight or more or 3 parts by weight or less. It is preferable to contain.
By setting the content of the photopolymerization initiator (C2) in the above range, an appropriate reaction sensitivity with respect to active energy rays can be obtained.
光重合開始剤（Ｃ２）の含有量を上記範囲とすることで、活性エネルギー線に対する適度な反応感度を得ることができる。 The content of the photopolymerization initiator (C2) is not particularly limited. As a standard, 0.1 to 10 parts by weight with respect to 100 parts by weight of the base polymer (A2), especially 0.5 parts by weight or more and 5 parts by weight or less, and more preferably 1 part by weight or more or 3 parts by weight or less. It is preferable to contain.
By setting the content of the photopolymerization initiator (C2) in the above range, an appropriate reaction sensitivity with respect to active energy rays can be obtained.
（波長変換剤（Ｄ２））
波長変換剤（Ｄ２）は、印刷隠蔽部など光が届き難い箇所の光硬化反応を促進させる機能を果たすものであって、前述の波長変換剤（Ｄ）に係る記載のものを適宜使用することができる。
波長変換剤（Ｄ２）の含有量は特に制限されるものではないが、ベースポリマー（Ａ２）１００質量部に対して、０．００１～２質量部、中でも０．００２質量部以上或いは１．５質量部以下、その中でも０．００４質量部以上或いは１質量部以下の割合で含有するのが好ましい。 (Wavelength conversion agent (D2))
The wavelength conversion agent (D2) fulfills the function of accelerating the photocuring reaction in places where it is difficult for light to reach, such as a printing concealment part, and the one described in the above-mentioned wavelength conversion agent (D) should be used as appropriate. Can do.
The content of the wavelength converting agent (D2) is not particularly limited, but is 0.001 to 2 parts by mass, particularly 0.002 parts by mass or more, or 1.5 to 100 parts by mass of the base polymer (A2). It is preferably contained in a proportion of not more than part by mass, and more preferably not less than 0.004 part by mass or not more than 1 part by mass.
波長変換剤（Ｄ２）は、印刷隠蔽部など光が届き難い箇所の光硬化反応を促進させる機能を果たすものであって、前述の波長変換剤（Ｄ）に係る記載のものを適宜使用することができる。
波長変換剤（Ｄ２）の含有量は特に制限されるものではないが、ベースポリマー（Ａ２）１００質量部に対して、０．００１～２質量部、中でも０．００２質量部以上或いは１．５質量部以下、その中でも０．００４質量部以上或いは１質量部以下の割合で含有するのが好ましい。 (Wavelength conversion agent (D2))
The wavelength conversion agent (D2) fulfills the function of accelerating the photocuring reaction in places where it is difficult for light to reach, such as a printing concealment part, and the one described in the above-mentioned wavelength conversion agent (D) should be used as appropriate. Can do.
The content of the wavelength converting agent (D2) is not particularly limited, but is 0.001 to 2 parts by mass, particularly 0.002 parts by mass or more, or 1.5 to 100 parts by mass of the base polymer (A2). It is preferably contained in a proportion of not more than part by mass, and more preferably not less than 0.004 part by mass or not more than 1 part by mass.
（その他の成分）
粘着剤組成物(II)は、上記以外の成分として、通常の粘着剤組成物に配合されている公知の成分を含有してもよい。例えば、必要に応じて、粘着付与樹脂や、酸化防止剤、光安定化剤、紫外線吸収剤、金属不活性化剤、防錆剤、老化防止剤、吸湿剤、発泡剤、消泡剤、無機粒子、粘度調整剤などの各種の添加剤を適宜含有させることが可能である。
また、必要に応じて反応触媒（三級アミン系化合物、四級アンモニウム系化合物、ラウリル酸スズ化合物など）を適宜含有してもよい。 (Other ingredients)
The pressure-sensitive adhesive composition (II) may contain known components blended in a normal pressure-sensitive adhesive composition as components other than those described above. For example, if necessary, tackifier resins, antioxidants, light stabilizers, UV absorbers, metal deactivators, rust inhibitors, anti-aging agents, hygroscopic agents, foaming agents, antifoaming agents, inorganic Various additives such as particles and viscosity modifiers can be contained as appropriate.
Moreover, you may contain reaction catalyst (A tertiary amine type compound, a quaternary ammonium type compound, a lauric acid tin compound, etc.) suitably as needed.
粘着剤組成物(II)は、上記以外の成分として、通常の粘着剤組成物に配合されている公知の成分を含有してもよい。例えば、必要に応じて、粘着付与樹脂や、酸化防止剤、光安定化剤、紫外線吸収剤、金属不活性化剤、防錆剤、老化防止剤、吸湿剤、発泡剤、消泡剤、無機粒子、粘度調整剤などの各種の添加剤を適宜含有させることが可能である。
また、必要に応じて反応触媒（三級アミン系化合物、四級アンモニウム系化合物、ラウリル酸スズ化合物など）を適宜含有してもよい。 (Other ingredients)
The pressure-sensitive adhesive composition (II) may contain known components blended in a normal pressure-sensitive adhesive composition as components other than those described above. For example, if necessary, tackifier resins, antioxidants, light stabilizers, UV absorbers, metal deactivators, rust inhibitors, anti-aging agents, hygroscopic agents, foaming agents, antifoaming agents, inorganic Various additives such as particles and viscosity modifiers can be contained as appropriate.
Moreover, you may contain reaction catalyst (A tertiary amine type compound, a quaternary ammonium type compound, a lauric acid tin compound, etc.) suitably as needed.
＜語句の説明＞
本明細書において「Ｘ～Ｙ」（Ｘ，Ｙは任意の数字）と表現する場合、特にことわらない限り「Ｘ以上Ｙ以下」の意と共に、「好ましくはＸより大きい」或いは「好ましくはＹより小さい」の意も包含する。
また、「Ｘ以上」（Ｘは任意の数字）或いは「Ｙ以下」（Ｙは任意の数字）と表現した場合、「Ｘより大きいことが好ましい」或いは「Ｙ未満であることが好ましい」旨の意図も包含する。
また、一般的に「シート」とは、ＪＩＳにおける定義上、薄く、一般にその厚さが長さと幅のわりには小さく平らな製品をいい、一般的に「フィルム」とは、長さ及び幅に比べて厚さが極めて小さく、最大厚さが任意に限定されている薄い平らな製品で、通常、ロールの形で供給されるものをいう（日本工業規格ＪＩＳ Ｋ６９００）。例えば厚さに関して言えば、狭義では１００μｍ以上のものをシートと称し、１００μｍ未満のものをフィルムと称すことがある。しかし、シートとフィルムの境界は定かでなく、本発明において文言上両者を区別する必要がないので、本発明においては、「フィルム」と称する場合でも「シート」を含むものとし、「シート」と称する場合でも「フィルム」を含むものとする。 <Explanation of words>
In the present specification, when expressed as “X to Y” (X and Y are arbitrary numbers), “X is preferably greater than X” or “preferably Y”, with the meaning of “X to Y” unless otherwise specified. It also includes the meaning of “smaller”.
In addition, when expressed as “X or more” (X is an arbitrary number) or “Y or less” (Y is an arbitrary number), it is “preferably greater than X” or “preferably less than Y”. Includes intentions.
In general, “sheet” is a thin product as defined by JIS and generally has a thickness that is small and flat instead of length and width. In general, “film” refers to length and width. A thin flat product having an extremely small thickness and an arbitrarily limited maximum thickness, which is usually supplied in the form of a roll (Japanese Industrial Standard JIS K6900). For example, in terms of thickness, in the narrow sense, a film having a thickness of 100 μm or more is sometimes referred to as a sheet, and a film having a thickness of less than 100 μm is sometimes referred to as a film. However, since the boundary between the sheet and the film is not clear and it is not necessary to distinguish the two in terms of the present invention, in the present invention, even when the term “film” is used, the term “sheet” is included and the term “sheet” is used. In some cases, “film” is included.
本明細書において「Ｘ～Ｙ」（Ｘ，Ｙは任意の数字）と表現する場合、特にことわらない限り「Ｘ以上Ｙ以下」の意と共に、「好ましくはＸより大きい」或いは「好ましくはＹより小さい」の意も包含する。
また、「Ｘ以上」（Ｘは任意の数字）或いは「Ｙ以下」（Ｙは任意の数字）と表現した場合、「Ｘより大きいことが好ましい」或いは「Ｙ未満であることが好ましい」旨の意図も包含する。
また、一般的に「シート」とは、ＪＩＳにおける定義上、薄く、一般にその厚さが長さと幅のわりには小さく平らな製品をいい、一般的に「フィルム」とは、長さ及び幅に比べて厚さが極めて小さく、最大厚さが任意に限定されている薄い平らな製品で、通常、ロールの形で供給されるものをいう（日本工業規格ＪＩＳ Ｋ６９００）。例えば厚さに関して言えば、狭義では１００μｍ以上のものをシートと称し、１００μｍ未満のものをフィルムと称すことがある。しかし、シートとフィルムの境界は定かでなく、本発明において文言上両者を区別する必要がないので、本発明においては、「フィルム」と称する場合でも「シート」を含むものとし、「シート」と称する場合でも「フィルム」を含むものとする。 <Explanation of words>
In the present specification, when expressed as “X to Y” (X and Y are arbitrary numbers), “X is preferably greater than X” or “preferably Y”, with the meaning of “X to Y” unless otherwise specified. It also includes the meaning of “smaller”.
In addition, when expressed as “X or more” (X is an arbitrary number) or “Y or less” (Y is an arbitrary number), it is “preferably greater than X” or “preferably less than Y”. Includes intentions.
In general, “sheet” is a thin product as defined by JIS and generally has a thickness that is small and flat instead of length and width. In general, “film” refers to length and width. A thin flat product having an extremely small thickness and an arbitrarily limited maximum thickness, which is usually supplied in the form of a roll (Japanese Industrial Standard JIS K6900). For example, in terms of thickness, in the narrow sense, a film having a thickness of 100 μm or more is sometimes referred to as a sheet, and a film having a thickness of less than 100 μm is sometimes referred to as a film. However, since the boundary between the sheet and the film is not clear and it is not necessary to distinguish the two in terms of the present invention, in the present invention, even when the term “film” is used, the term “sheet” is included and the term “sheet” is used. In some cases, “film” is included.
以下、実施例及び比較例によりさらに詳しく説明する。但し、本発明はこれらに限定されるものではない。
Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. However, the present invention is not limited to these.
［実施例１］
アクリル系共重合体（Ａ）として、数平均分子量２４００のポリメタクリル酸メチルマクロモノマー１５重量部とブチルアクリレート８１重量部とアクリル酸４重量部とがランダム共重合してなるアクリル酸エステル共重合体（Ａ－１）（重量平均分子量２３万）を用い、当該アクリル酸エステル共重合体（Ａ－１）１ｋｇに対し、架橋剤（Ｂ）としてのグリセリンジメタクリレート（Ｂ－１）９０ｇと、光重合開始剤（Ｃ）としてのエザキュアＫＴＯ４６（Ｌａｎｂｅｒｔｉ社製）（Ｃ－１）１５ｇと、波長変換剤（Ｄ）としての２，５－ビス（５－ｔ－ブチル－２－ベンゾオキサゾリル）チオフェン（ＴｉｎｏｐａＯＢ，ＢＡＳＦ社製）（Ｄ－１）０．１ｇとを均一に混合して、粘着剤樹脂組成物１を作製した。
剥離処理したポリエチレンテレフタレートフィルム（「剥離フィルム１」と称する。三菱樹脂社製「ダイアホイルＭＲＶ－Ｖ０６」、厚さ１００μｍ）と、剥離処理したポリエチレンテレフタレートフィルム（「剥離フィルム２」と称する。三菱樹脂社製「ダイアホイルＭＲＱ」、厚さ７５μｍ）との２枚の剥離フィルム１，２とで、前記粘着剤樹脂組成物１を挟み、ラミネータを用いて厚さ２００μｍとなるようシート状に賦形して、粘着シート１を作製した。 [Example 1]
As the acrylic copolymer (A), an acrylic ester copolymer obtained by random copolymerization of 15 parts by weight of a polymethyl methacrylate macromonomer having a number average molecular weight of 2400, 81 parts by weight of butyl acrylate, and 4 parts by weight of acrylic acid. (A-1) (weight average molecular weight 230,000), 1 g of the acrylate copolymer (A-1), 90 g of glycerin dimethacrylate (B-1) as a crosslinking agent (B), light Ezacure KTO46 (manufactured by Lanberti) (C-1) as a polymerization initiator (C) (15 g) and 2,5-bis (5-tert-butyl-2-benzoxazolyl) as a wavelength conversion agent (D) Thiophene (TinopaOB, manufactured by BASF) (D-1) (0.1 g) was uniformly mixed to prepare an adhesive resin composition 1.
A release-treated polyethylene terephthalate film (referred to as “release film 1”, “Diafoil MRV-V06”, thickness 100 μm) manufactured by Mitsubishi Plastics Co., Ltd., and a release-treated polyethylene terephthalate film (referred to as “release film 2”). The adhesive resin composition 1 is sandwiched between two release films 1 and 2 with “Diafoil MRQ” (75 μm in thickness) manufactured by the company and shaped into a sheet shape using a laminator to a thickness of 200 μm. Thus, the pressure-sensitive adhesive sheet 1 was produced.
アクリル系共重合体（Ａ）として、数平均分子量２４００のポリメタクリル酸メチルマクロモノマー１５重量部とブチルアクリレート８１重量部とアクリル酸４重量部とがランダム共重合してなるアクリル酸エステル共重合体（Ａ－１）（重量平均分子量２３万）を用い、当該アクリル酸エステル共重合体（Ａ－１）１ｋｇに対し、架橋剤（Ｂ）としてのグリセリンジメタクリレート（Ｂ－１）９０ｇと、光重合開始剤（Ｃ）としてのエザキュアＫＴＯ４６（Ｌａｎｂｅｒｔｉ社製）（Ｃ－１）１５ｇと、波長変換剤（Ｄ）としての２，５－ビス（５－ｔ－ブチル－２－ベンゾオキサゾリル）チオフェン（ＴｉｎｏｐａＯＢ，ＢＡＳＦ社製）（Ｄ－１）０．１ｇとを均一に混合して、粘着剤樹脂組成物１を作製した。
剥離処理したポリエチレンテレフタレートフィルム（「剥離フィルム１」と称する。三菱樹脂社製「ダイアホイルＭＲＶ－Ｖ０６」、厚さ１００μｍ）と、剥離処理したポリエチレンテレフタレートフィルム（「剥離フィルム２」と称する。三菱樹脂社製「ダイアホイルＭＲＱ」、厚さ７５μｍ）との２枚の剥離フィルム１，２とで、前記粘着剤樹脂組成物１を挟み、ラミネータを用いて厚さ２００μｍとなるようシート状に賦形して、粘着シート１を作製した。 [Example 1]
As the acrylic copolymer (A), an acrylic ester copolymer obtained by random copolymerization of 15 parts by weight of a polymethyl methacrylate macromonomer having a number average molecular weight of 2400, 81 parts by weight of butyl acrylate, and 4 parts by weight of acrylic acid. (A-1) (weight average molecular weight 230,000), 1 g of the acrylate copolymer (A-1), 90 g of glycerin dimethacrylate (B-1) as a crosslinking agent (B), light Ezacure KTO46 (manufactured by Lanberti) (C-1) as a polymerization initiator (C) (15 g) and 2,5-bis (5-tert-butyl-2-benzoxazolyl) as a wavelength conversion agent (D) Thiophene (TinopaOB, manufactured by BASF) (D-1) (0.1 g) was uniformly mixed to prepare an adhesive resin composition 1.
A release-treated polyethylene terephthalate film (referred to as “release film 1”, “Diafoil MRV-V06”, thickness 100 μm) manufactured by Mitsubishi Plastics Co., Ltd., and a release-treated polyethylene terephthalate film (referred to as “release film 2”). The adhesive resin composition 1 is sandwiched between two release films 1 and 2 with “Diafoil MRQ” (75 μm in thickness) manufactured by the company and shaped into a sheet shape using a laminator to a thickness of 200 μm. Thus, the pressure-sensitive adhesive sheet 1 was produced.
なお、波長変換剤（Ｄ）としての２，５－ビス(５－ｔ－ブチル－２－ベンゾオキサゾリル)チオフェン（Ｄ－１）は、有機系の蛍光体であり、アクリル系共重合体（Ａ－１）に相溶する性質を有している。
上記アクリル系共重合体（Ａ－１）は、枝成分としてマクロモノマーを備えたグラフト共重合体からなる（メタ）アクリル酸エステル共重合体の一種である。 前記粘着剤樹脂組成物１は、未架橋状態において加熱により軟化乃至流動するホットメルト性を有すると共に、光で架橋する光架橋性を有するものである。 Note that 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiophene (D-1) as the wavelength converting agent (D) is an organic phosphor, and is an acrylic copolymer. It has a property compatible with (A-1).
The acrylic copolymer (A-1) is a kind of (meth) acrylic acid ester copolymer composed of a graft copolymer having a macromonomer as a branch component. The pressure-sensitive adhesive resin composition 1 has a hot-melt property that softens or flows when heated in an uncrosslinked state, and also has a photo-crosslinkability that crosslinks with light.
上記アクリル系共重合体（Ａ－１）は、枝成分としてマクロモノマーを備えたグラフト共重合体からなる（メタ）アクリル酸エステル共重合体の一種である。 前記粘着剤樹脂組成物１は、未架橋状態において加熱により軟化乃至流動するホットメルト性を有すると共に、光で架橋する光架橋性を有するものである。 Note that 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiophene (D-1) as the wavelength converting agent (D) is an organic phosphor, and is an acrylic copolymer. It has a property compatible with (A-1).
The acrylic copolymer (A-1) is a kind of (meth) acrylic acid ester copolymer composed of a graft copolymer having a macromonomer as a branch component. The pressure-sensitive adhesive resin composition 1 has a hot-melt property that softens or flows when heated in an uncrosslinked state, and also has a photo-crosslinkability that crosslinks with light.
［実施例２］
波長変換剤（Ｄ）としての２，５－ビス(５－ｔ－ブチル－２－ベンゾオキサゾリル)チオフェン（ＴｉｎｏｐａＯＢ，ＢＡＳＦ社製）（Ｄ－１）の混合量を０．５ｇに変更した以外は、実施例１と同様にして粘着剤樹脂組成物２を作製した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物２を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート２を作製した。 [Example 2]
The mixing amount of 2,5-bis (5-t-butyl-2-benzoxazolyl) thiophene (TinopaOB, manufactured by BASF) (D-1) as the wavelength converting agent (D) was changed to 0.5 g. Except for the above, an adhesive resin composition 2 was produced in the same manner as in Example 1.
And like Example 1, this adhesive resin composition 2 was pinched | interposed with the peeling films 1 and 2, and it shape | molded in the sheet form so that it might become thickness 150 micrometers using the laminator, and produced the adhesive sheet 2. .
波長変換剤（Ｄ）としての２，５－ビス(５－ｔ－ブチル－２－ベンゾオキサゾリル)チオフェン（ＴｉｎｏｐａＯＢ，ＢＡＳＦ社製）（Ｄ－１）の混合量を０．５ｇに変更した以外は、実施例１と同様にして粘着剤樹脂組成物２を作製した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物２を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート２を作製した。 [Example 2]
The mixing amount of 2,5-bis (5-t-butyl-2-benzoxazolyl) thiophene (TinopaOB, manufactured by BASF) (D-1) as the wavelength converting agent (D) was changed to 0.5 g. Except for the above, an adhesive resin composition 2 was produced in the same manner as in Example 1.
And like Example 1, this adhesive resin composition 2 was pinched | interposed with the peeling films 1 and 2, and it shape | molded in the sheet form so that it might become thickness 150 micrometers using the laminator, and produced the adhesive sheet 2. .
［実施例３］
波長変換剤（Ｄ）としての２，５－ビス(５－ｔ－ブチル－２－ベンゾオキサゾリル)チオフェン（ＴｉｎｏｐａＯＢ，ＢＡＳＦ社製）（Ｄ－１）の混合量を１ｇに変更した以外は、実施例１と同様にして粘着剤樹脂組成物３を作製した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物３を挟み、ラミネータを用いて厚さ１２５μｍとなるようシート状に賦形して、粘着シート３を作製した。 [Example 3]
Except that the mixing amount of 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiophene (TinopaOB, manufactured by BASF) (D-1) as the wavelength converting agent (D) was changed to 1 g. In the same manner as in Example 1, a pressure-sensitive adhesive resin composition 3 was produced.
And like Example 1, this adhesive resin composition 3 was pinched | interposed with the peeling films 1 and 2, and it shape | molded in the sheet form so that it might become 125 micrometers in thickness using the laminator, and produced the adhesive sheet 3. .
波長変換剤（Ｄ）としての２，５－ビス(５－ｔ－ブチル－２－ベンゾオキサゾリル)チオフェン（ＴｉｎｏｐａＯＢ，ＢＡＳＦ社製）（Ｄ－１）の混合量を１ｇに変更した以外は、実施例１と同様にして粘着剤樹脂組成物３を作製した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物３を挟み、ラミネータを用いて厚さ１２５μｍとなるようシート状に賦形して、粘着シート３を作製した。 [Example 3]
Except that the mixing amount of 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiophene (TinopaOB, manufactured by BASF) (D-1) as the wavelength converting agent (D) was changed to 1 g. In the same manner as in Example 1, a pressure-sensitive adhesive resin composition 3 was produced.
And like Example 1, this adhesive resin composition 3 was pinched | interposed with the peeling films 1 and 2, and it shape | molded in the sheet form so that it might become 125 micrometers in thickness using the laminator, and produced the adhesive sheet 3. .
［実施例４］
実施例１で用いたアクリル酸エステル共重合体（Ａ－１）１ｋｇに対して、架橋剤（Ｂ）としてのトリメチロールプロパンエポキシアクリレート（Ｂ－２）１００ｇと、光重合開始剤（Ｃ）としてのエザキュアＫＴＯ４６（Ｌａｎｂｅｒｔｉ社製）（Ｃ－１）３０ｇと、波長変換剤（Ｄ）としての２，５－ビス(５－ｔ－ブチル－２－ベンゾオキサゾリル)チオフェン（Ｄ－１）０．２ｇとを均一に混合して、粘着剤樹脂組成物４を作製した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物４を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート４を作製した。 [Example 4]
For 1 kg of the acrylic ester copolymer (A-1) used in Example 1, 100 g of trimethylolpropane epoxy acrylate (B-2) as a crosslinking agent (B) and a photopolymerization initiator (C) Ezacure KTO46 (manufactured by Lanberti) (C-1) 30 g and 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiophene (D-1) 0 as wavelength converting agent (D) .2 g was uniformly mixed to prepare an adhesive resin composition 4.
And like Example 1, this adhesive resin composition 4 was pinched | interposed with the peeling films 1 and 2, and it shape | molded into the sheet form so that it might become 150 micrometers in thickness using the laminator, and produced the adhesive sheet 4. .
実施例１で用いたアクリル酸エステル共重合体（Ａ－１）１ｋｇに対して、架橋剤（Ｂ）としてのトリメチロールプロパンエポキシアクリレート（Ｂ－２）１００ｇと、光重合開始剤（Ｃ）としてのエザキュアＫＴＯ４６（Ｌａｎｂｅｒｔｉ社製）（Ｃ－１）３０ｇと、波長変換剤（Ｄ）としての２，５－ビス(５－ｔ－ブチル－２－ベンゾオキサゾリル)チオフェン（Ｄ－１）０．２ｇとを均一に混合して、粘着剤樹脂組成物４を作製した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物４を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート４を作製した。 [Example 4]
For 1 kg of the acrylic ester copolymer (A-1) used in Example 1, 100 g of trimethylolpropane epoxy acrylate (B-2) as a crosslinking agent (B) and a photopolymerization initiator (C) Ezacure KTO46 (manufactured by Lanberti) (C-1) 30 g and 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiophene (D-1) 0 as wavelength converting agent (D) .2 g was uniformly mixed to prepare an adhesive resin composition 4.
And like Example 1, this adhesive resin composition 4 was pinched | interposed with the peeling films 1 and 2, and it shape | molded into the sheet form so that it might become 150 micrometers in thickness using the laminator, and produced the adhesive sheet 4. .
なお、前記粘着剤樹脂組成物４は、未架橋状態において加熱により軟化乃至流動するホットメルト性を有すると共に、光で架橋する光架橋性を有するものである。
The pressure-sensitive adhesive resin composition 4 has a hot-melt property that softens or flows when heated in an uncrosslinked state, and also has a photo-crosslinkability that crosslinks with light.
［実施例５］
実施例４において、（Ｃ－１）３０ｇを混合する代わりに、光重合開始剤（Ｃ）としてのエザキュアＴＺＴ（Ｌａｎｂｅｒｔｉ社製）（Ｃ－２）１５ｇを混合すると共に、光増感剤としてのエザキュアＡ１９８（Ｌａｎｂｅｒｔｉ社製）５０ｇを混合した以外は、実施例４と同様にして粘着剤樹脂組成物５を作製した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物５を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート５を作製した。 [Example 5]
In Example 4, instead of mixing 30 g of (C-1), 15 g of Ezacure TZT (manufactured by Lanberti) (C-2) as a photopolymerization initiator (C) was mixed and used as a photosensitizer. A pressure-sensitive adhesive resin composition 5 was produced in the same manner as in Example 4 except that 50 g of Ezacure A198 (manufactured by Lanberti) was mixed.
And like Example 1, this adhesive resin composition 5 was pinched | interposed with the peeling films 1 and 2, and it shape | molded into the sheet form so that it might become 150 micrometers in thickness using the laminator, and produced the adhesive sheet 5. .
実施例４において、（Ｃ－１）３０ｇを混合する代わりに、光重合開始剤（Ｃ）としてのエザキュアＴＺＴ（Ｌａｎｂｅｒｔｉ社製）（Ｃ－２）１５ｇを混合すると共に、光増感剤としてのエザキュアＡ１９８（Ｌａｎｂｅｒｔｉ社製）５０ｇを混合した以外は、実施例４と同様にして粘着剤樹脂組成物５を作製した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物５を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート５を作製した。 [Example 5]
In Example 4, instead of mixing 30 g of (C-1), 15 g of Ezacure TZT (manufactured by Lanberti) (C-2) as a photopolymerization initiator (C) was mixed and used as a photosensitizer. A pressure-sensitive adhesive resin composition 5 was produced in the same manner as in Example 4 except that 50 g of Ezacure A198 (manufactured by Lanberti) was mixed.
And like Example 1, this adhesive resin composition 5 was pinched | interposed with the peeling films 1 and 2, and it shape | molded into the sheet form so that it might become 150 micrometers in thickness using the laminator, and produced the adhesive sheet 5. .
［実施例６］
実施例１において、波長変換剤（Ｄ－１）０．１ｇを混合する代わりに、波長変換剤（Ｄ）として、ハッコールＰＹ１８００（昭和化学工業株式会社製）（Ｄ－２）１ｇを混合した以外は、実施例１と同様にして粘着剤樹脂組成物６を作成した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物６を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート６を作製した。 [Example 6]
In Example 1, instead of mixing 0.1 g of the wavelength converting agent (D-1), as the wavelength converting agent (D), 1 g of Hackol PY1800 (manufactured by Showa Chemical Industry Co., Ltd.) (D-2) was mixed. Produced the adhesive resin composition 6 in the same manner as in Example 1.
And like Example 1, this adhesive resin composition 6 was pinched | interposed with the peeling films 1 and 2, and it shape | molded in the sheet form so that it might become 150 micrometers in thickness using the laminator, and produced the adhesive sheet 6. .
実施例１において、波長変換剤（Ｄ－１）０．１ｇを混合する代わりに、波長変換剤（Ｄ）として、ハッコールＰＹ１８００（昭和化学工業株式会社製）（Ｄ－２）１ｇを混合した以外は、実施例１と同様にして粘着剤樹脂組成物６を作成した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物６を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート６を作製した。 [Example 6]
In Example 1, instead of mixing 0.1 g of the wavelength converting agent (D-1), as the wavelength converting agent (D), 1 g of Hackol PY1800 (manufactured by Showa Chemical Industry Co., Ltd.) (D-2) was mixed. Produced the adhesive resin composition 6 in the same manner as in Example 1.
And like Example 1, this adhesive resin composition 6 was pinched | interposed with the peeling films 1 and 2, and it shape | molded in the sheet form so that it might become 150 micrometers in thickness using the laminator, and produced the adhesive sheet 6. .
なお、波長変換剤（Ｄ）としてのハッコールＰＹ１８００は、有機系の蛍光体であり、アクリル系共重合体（Ａ－１）に相溶する性質を有している。
前記粘着剤樹脂組成物６は、未架橋状態において加熱により軟化乃至流動するホットメルト性を有すると共に、光で架橋する光架橋性を有するものである。 Hackol PY1800 as the wavelength converting agent (D) is an organic phosphor and has a property compatible with the acrylic copolymer (A-1).
The pressure-sensitive adhesive resin composition 6 has a hot-melt property that softens or flows when heated in an uncrosslinked state, and also has a photo-crosslinkability that crosslinks with light.
前記粘着剤樹脂組成物６は、未架橋状態において加熱により軟化乃至流動するホットメルト性を有すると共に、光で架橋する光架橋性を有するものである。 Hackol PY1800 as the wavelength converting agent (D) is an organic phosphor and has a property compatible with the acrylic copolymer (A-1).
The pressure-sensitive adhesive resin composition 6 has a hot-melt property that softens or flows when heated in an uncrosslinked state, and also has a photo-crosslinkability that crosslinks with light.
［実施例７］
実施例１において、波長変換剤（Ｄ－１）０．１ｇを混合する代わりに、波長変換剤（Ｄ）として、ハッコールＰＳＲ（昭和化学工業株式会社製）（Ｄ－３）１ｇを混合した以外は、実施例１と同様にして粘着剤樹脂組成物７を作成した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物７を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート７を作製した。 [Example 7]
In Example 1, instead of mixing 0.1 g of the wavelength converting agent (D-1), 1 g of Hackol PSR (manufactured by Showa Chemical Industry Co., Ltd.) (D-3) was mixed as the wavelength converting agent (D). Produced adhesive resin composition 7 in the same manner as in Example 1.
And like Example 1, this adhesive resin composition 7 was pinched | interposed with the peeling films 1 and 2, and it shape | molded in the sheet form so that it might become thickness 150 micrometers using the laminator, and produced the adhesive sheet 7. .
実施例１において、波長変換剤（Ｄ－１）０．１ｇを混合する代わりに、波長変換剤（Ｄ）として、ハッコールＰＳＲ（昭和化学工業株式会社製）（Ｄ－３）１ｇを混合した以外は、実施例１と同様にして粘着剤樹脂組成物７を作成した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物７を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート７を作製した。 [Example 7]
In Example 1, instead of mixing 0.1 g of the wavelength converting agent (D-1), 1 g of Hackol PSR (manufactured by Showa Chemical Industry Co., Ltd.) (D-3) was mixed as the wavelength converting agent (D). Produced adhesive resin composition 7 in the same manner as in Example 1.
And like Example 1, this adhesive resin composition 7 was pinched | interposed with the peeling films 1 and 2, and it shape | molded in the sheet form so that it might become thickness 150 micrometers using the laminator, and produced the adhesive sheet 7. .
なお、波長変換剤（Ｄ）としてのハッコールＰＳＲは、有機系の蛍光体であり、アクリル系共重合体（Ａ－１）に相溶する性質を有している。
前記粘着剤樹脂組成物７は、未架橋状態において加熱により軟化乃至流動するホットメルト性を有すると共に、光で架橋する光架橋性を有するものである。 Hackol PSR as the wavelength converting agent (D) is an organic phosphor and has a property compatible with the acrylic copolymer (A-1).
The pressure-sensitive adhesive resin composition 7 has a hot-melt property that softens or flows when heated in an uncrosslinked state, and has a photo-crosslinkability that crosslinks with light.
前記粘着剤樹脂組成物７は、未架橋状態において加熱により軟化乃至流動するホットメルト性を有すると共に、光で架橋する光架橋性を有するものである。 Hackol PSR as the wavelength converting agent (D) is an organic phosphor and has a property compatible with the acrylic copolymer (A-1).
The pressure-sensitive adhesive resin composition 7 has a hot-melt property that softens or flows when heated in an uncrosslinked state, and has a photo-crosslinkability that crosslinks with light.
［実施例８］
ビニル系共重合体（Ａ）として、２－エチルヘキシルアクリレート５５重量部と、酢酸ビニル４０重量部と、アクリル酸５重量部とがランダム共重合してなるビニル系共重合体（Ａ－２）（重量平均分子量：１７万）を用い、該ビニル系共重合体（Ａ－２）１ｋｇに対して、架橋剤（Ｂ）としての（２，４，６－トリオキソ－１，３，５－トリアジナン－１，３，５－トリイル）トリエチレントリアクリラート（Ｂ－３）（東亜合成製，アロニックスＭ３１５）７５ｇと、光重合開始剤（Ｃ）としてのエザキュアＫＴＯ４６（Ｃ－１）（Ｌａｎｂｅｒｔｉ社製）１５ｇと、波長変換剤（Ｄ）としての２，５－ビス(５－ｔ－ブチル－２－ベンゾオキサゾリル)チオフェン（ＴｉｎｏｐａＯＢ，ＢＡＳＦ社製）（Ｄ－１）０．２ｇとを均一混合して、粘着剤樹脂組成物８を作製した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物８を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート８を作製した。 [Example 8]
As the vinyl copolymer (A), a vinyl copolymer (A-2) obtained by random copolymerization of 55 parts by weight of 2-ethylhexyl acrylate, 40 parts by weight of vinyl acetate, and 5 parts by weight of acrylic acid. (2,4,6-trioxo-1,3,5-triazinan) as a crosslinking agent (B) with respect to 1 kg of the vinyl copolymer (A-2). 1,3,5-triyl) triethylenetriacrylate (B-3) (Toa Gosei, Aronix M315) and Ezacure KTO46 (C-1) as a photopolymerization initiator (C) (manufactured by Lanberti) 15 g and 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiophene (TinopaOB, manufactured by BASF) (D-1) 0.2 g as a wavelength converting agent (D) are mixed uniformly. Shi To prepare a pressure-sensitive adhesive resin composition 8.
And like Example 1, this adhesive resin composition 8 was pinched | interposed with the peeling films 1 and 2, and it shape | molded in the sheet form so that it might become thickness 150 micrometers using the laminator, and produced the adhesive sheet 8. .
ビニル系共重合体（Ａ）として、２－エチルヘキシルアクリレート５５重量部と、酢酸ビニル４０重量部と、アクリル酸５重量部とがランダム共重合してなるビニル系共重合体（Ａ－２）（重量平均分子量：１７万）を用い、該ビニル系共重合体（Ａ－２）１ｋｇに対して、架橋剤（Ｂ）としての（２，４，６－トリオキソ－１，３，５－トリアジナン－１，３，５－トリイル）トリエチレントリアクリラート（Ｂ－３）（東亜合成製，アロニックスＭ３１５）７５ｇと、光重合開始剤（Ｃ）としてのエザキュアＫＴＯ４６（Ｃ－１）（Ｌａｎｂｅｒｔｉ社製）１５ｇと、波長変換剤（Ｄ）としての２，５－ビス(５－ｔ－ブチル－２－ベンゾオキサゾリル)チオフェン（ＴｉｎｏｐａＯＢ，ＢＡＳＦ社製）（Ｄ－１）０．２ｇとを均一混合して、粘着剤樹脂組成物８を作製した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物８を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート８を作製した。 [Example 8]
As the vinyl copolymer (A), a vinyl copolymer (A-2) obtained by random copolymerization of 55 parts by weight of 2-ethylhexyl acrylate, 40 parts by weight of vinyl acetate, and 5 parts by weight of acrylic acid. (2,4,6-trioxo-1,3,5-triazinan) as a crosslinking agent (B) with respect to 1 kg of the vinyl copolymer (A-2). 1,3,5-triyl) triethylenetriacrylate (B-3) (Toa Gosei, Aronix M315) and Ezacure KTO46 (C-1) as a photopolymerization initiator (C) (manufactured by Lanberti) 15 g and 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiophene (TinopaOB, manufactured by BASF) (D-1) 0.2 g as a wavelength converting agent (D) are mixed uniformly. Shi To prepare a pressure-sensitive adhesive resin composition 8.
And like Example 1, this adhesive resin composition 8 was pinched | interposed with the peeling films 1 and 2, and it shape | molded in the sheet form so that it might become thickness 150 micrometers using the laminator, and produced the adhesive sheet 8. .
なお、波長変換剤（Ｄ）としての２，５－ビス(５－ｔ－ブチル－２－ベンゾオキサゾリル)チオフェン（Ｄ－１）は、有機系の蛍光体であり、ビニル系共重合体（Ａ－２）に相溶する性質を有している。
上記ビニル系共重合体（Ａ－２）は、ガラス転移温度（Ｔｇ）が０℃未満のモノマーａと、ガラス転移温度（Ｔｇ）が０℃以上８０℃未満のモノマーｂと、ガラス転移温度（Ｔｇ）が８０℃以上のモノマーｃとが、ａ：ｂ：ｃ＝１０～４０：９０～３５：０～２５のモル比率で共重合してなるビニル系共重合体の一種である。
前記粘着剤樹脂組成物８は、未架橋状態において加熱により軟化乃至流動するホットメルト性を有すると共に、光で架橋する光架橋性を有するものである。 In addition, 2,5-bis (5-t-butyl-2-benzoxazolyl) thiophene (D-1) as the wavelength converting agent (D) is an organic phosphor and a vinyl copolymer. It has a property compatible with (A-2).
The vinyl copolymer (A-2) comprises a monomer a having a glass transition temperature (Tg) of less than 0 ° C., a monomer b having a glass transition temperature (Tg) of from 0 ° C. to less than 80 ° C., and a glass transition temperature ( Tg) is a kind of vinyl copolymer obtained by copolymerization with a monomer c having a temperature of 80 ° C. or higher at a molar ratio of a: b: c = 10 to 40:90 to 35: 0 to 25.
The pressure-sensitive adhesive resin composition 8 has a hot-melt property that softens or flows when heated in an uncrosslinked state, and has a photo-crosslinkability that crosslinks with light.
上記ビニル系共重合体（Ａ－２）は、ガラス転移温度（Ｔｇ）が０℃未満のモノマーａと、ガラス転移温度（Ｔｇ）が０℃以上８０℃未満のモノマーｂと、ガラス転移温度（Ｔｇ）が８０℃以上のモノマーｃとが、ａ：ｂ：ｃ＝１０～４０：９０～３５：０～２５のモル比率で共重合してなるビニル系共重合体の一種である。
前記粘着剤樹脂組成物８は、未架橋状態において加熱により軟化乃至流動するホットメルト性を有すると共に、光で架橋する光架橋性を有するものである。 In addition, 2,5-bis (5-t-butyl-2-benzoxazolyl) thiophene (D-1) as the wavelength converting agent (D) is an organic phosphor and a vinyl copolymer. It has a property compatible with (A-2).
The vinyl copolymer (A-2) comprises a monomer a having a glass transition temperature (Tg) of less than 0 ° C., a monomer b having a glass transition temperature (Tg) of from 0 ° C. to less than 80 ° C., and a glass transition temperature ( Tg) is a kind of vinyl copolymer obtained by copolymerization with a monomer c having a temperature of 80 ° C. or higher at a molar ratio of a: b: c = 10 to 40:90 to 35: 0 to 25.
The pressure-sensitive adhesive resin composition 8 has a hot-melt property that softens or flows when heated in an uncrosslinked state, and has a photo-crosslinkability that crosslinks with light.
［実施例９］
剥離フィルム１の代わりに、紫外線吸収剤を塗布したポリエチレンテレフタレートフィルム（三菱樹脂製「ダイアホイルＯ７００Ｅ－１００」、厚さ１００μｍ）に剥離処理を施したフィルム（「剥離フィルム３」と称する）を用いた以外は実施例２と同様にして、粘着シート９を作成した。 [Example 9]
Instead of the release film 1, a polyethylene terephthalate film (Mitsubishi Resin “Diafoil O700E-100”, thickness 100 μm) coated with an ultraviolet absorber is used (referred to as “release film 3”). A pressure-sensitive adhesive sheet 9 was prepared in the same manner as in Example 2 except that.
剥離フィルム１の代わりに、紫外線吸収剤を塗布したポリエチレンテレフタレートフィルム（三菱樹脂製「ダイアホイルＯ７００Ｅ－１００」、厚さ１００μｍ）に剥離処理を施したフィルム（「剥離フィルム３」と称する）を用いた以外は実施例２と同様にして、粘着シート９を作成した。 [Example 9]
Instead of the release film 1, a polyethylene terephthalate film (Mitsubishi Resin “Diafoil O700E-100”, thickness 100 μm) coated with an ultraviolet absorber is used (referred to as “release film 3”). A pressure-sensitive adhesive sheet 9 was prepared in the same manner as in Example 2 except that.
［比較例１］
波長変換剤（Ｄ）として、２，５－ビス（５－ｔ－ブチル－２－ベンゾオキサゾリル）チオフェン（ＴｉｎｏｐａＯＢ，ＢＡＳＦ社製）（Ｄ－１）を加えない以外は、実施例１と同様にして、粘着剤組成物１０を作成した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物９を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート１０を作製した。 [Comparative Example 1]
Example 1 except that 2,5-bis (5-t-butyl-2-benzoxazolyl) thiophene (TinopaOB, manufactured by BASF) (D-1) was not added as the wavelength converting agent (D). Similarly, the pressure-sensitive adhesive composition 10 was prepared.
And like Example 1, this adhesive resin composition 9 was pinched | interposed with the peeling films 1 and 2, and it shape | molded in the sheet form so that it might become 150 micrometers in thickness using the laminator, and produced the adhesive sheet 10. .
波長変換剤（Ｄ）として、２，５－ビス（５－ｔ－ブチル－２－ベンゾオキサゾリル）チオフェン（ＴｉｎｏｐａＯＢ，ＢＡＳＦ社製）（Ｄ－１）を加えない以外は、実施例１と同様にして、粘着剤組成物１０を作成した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物９を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート１０を作製した。 [Comparative Example 1]
Example 1 except that 2,5-bis (5-t-butyl-2-benzoxazolyl) thiophene (TinopaOB, manufactured by BASF) (D-1) was not added as the wavelength converting agent (D). Similarly, the pressure-sensitive adhesive composition 10 was prepared.
And like Example 1, this adhesive resin composition 9 was pinched | interposed with the peeling films 1 and 2, and it shape | molded in the sheet form so that it might become 150 micrometers in thickness using the laminator, and produced the adhesive sheet 10. .
［比較例２］
実施例１で用いたアクリル酸エステル共重合体（Ａ－１）１ｋｇに対して、架橋剤（Ｂ）として、トリメチロールプロパンエポキシアクリレート（Ｂ－２）９０ｇと、光重合開始剤（Ｃ）としてのエザキュアＫＴＯ４６（Ｌａｎｂｅｒｔｉ社製）（Ｃ－１）１５ｇ、波長変換剤（Ｄ）として、２，５－ビス(５－ｔ－ブチル－２－ベンゾオキサゾリル)チオフェン（Ｄ－１）２ｇを均一混合し、粘着剤樹脂組成物１１を作製した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物１１を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート１１を作製した。 [Comparative Example 2]
As a crosslinking agent (B), 90 g of trimethylolpropane epoxy acrylate (B-2) and a photopolymerization initiator (C) with respect to 1 kg of the acrylic ester copolymer (A-1) used in Example 1 Ezacure KTO46 (manufactured by Lanberti) (C-1) (15 g) and 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiophene (D-1) 2 g as a wavelength converting agent (D) It mixed uniformly and produced the adhesive resin composition 11.
And like Example 1, this adhesive resin composition 11 was pinched | interposed with the peeling films 1 and 2, and it shape | molded into the sheet form so that it might become thickness 150 micrometers using the laminator, and produced the adhesive sheet 11 .
実施例１で用いたアクリル酸エステル共重合体（Ａ－１）１ｋｇに対して、架橋剤（Ｂ）として、トリメチロールプロパンエポキシアクリレート（Ｂ－２）９０ｇと、光重合開始剤（Ｃ）としてのエザキュアＫＴＯ４６（Ｌａｎｂｅｒｔｉ社製）（Ｃ－１）１５ｇ、波長変換剤（Ｄ）として、２，５－ビス(５－ｔ－ブチル－２－ベンゾオキサゾリル)チオフェン（Ｄ－１）２ｇを均一混合し、粘着剤樹脂組成物１１を作製した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物１１を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形して、粘着シート１１を作製した。 [Comparative Example 2]
As a crosslinking agent (B), 90 g of trimethylolpropane epoxy acrylate (B-2) and a photopolymerization initiator (C) with respect to 1 kg of the acrylic ester copolymer (A-1) used in Example 1 Ezacure KTO46 (manufactured by Lanberti) (C-1) (15 g) and 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiophene (D-1) 2 g as a wavelength converting agent (D) It mixed uniformly and produced the adhesive resin composition 11.
And like Example 1, this adhesive resin composition 11 was pinched | interposed with the peeling films 1 and 2, and it shape | molded into the sheet form so that it might become thickness 150 micrometers using the laminator, and produced the adhesive sheet 11 .
［比較例３］
特許４９７１５２９号公報の実施例３に準じて粘着剤組成物１２を作製した。
すなわち、２－エチルヘキシルアクリレート７５質量部と酢酸ビニル２０質量部とアクリル酸５質量部とをランダム共重合してなるアクリル酸エステル共重合体前記アクリル酸エステル共重合体（Ａ－３）１ｋｇに、架橋剤（Ｂ）としてノナンジオールジアクリレート（Ｖ＃２６０，大阪有機化学社製）（Ｂ－４）５０ｇ及び光重合開始剤（Ｃ）として４－メチルベンゾフェノン（Ｃ－３）１０ｇを混合添加して粘着剤樹脂組成物１２を調製した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物１２を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形した。
続いて、ポリエチレンテレフタレートフィルムを介して、粘着層に波長３６５ｎｍの紫外線が１０００ｍＪ／ｃｍ２到達するよう紫外線を照射し、架橋剤を一部反応させて、粘着シート１２（厚さ１５０μｍ）を作製した。 [Comparative Example 3]
A pressure-sensitive adhesive composition 12 was produced according to Example 3 of Japanese Patent No. 4971529.
That is, an acrylic ester copolymer obtained by random copolymerization of 75 parts by mass of 2-ethylhexyl acrylate, 20 parts by mass of vinyl acetate and 5 parts by mass of acrylic acid, into 1 kg of the acrylic ester copolymer (A-3), 50 g of nonanediol diacrylate (V # 260, manufactured by Osaka Organic Chemical Co., Ltd.) (B-4) as a crosslinking agent (B) and 10 g of 4-methylbenzophenone (C-3) as a photopolymerization initiator (C) were mixed and added. Thus, an adhesive resin composition 12 was prepared.
And like Example 1, this adhesive resin composition 12 was pinched | interposed with the peeling films 1 and 2, and it shape | molded in the sheet form so that it might become 150 micrometers in thickness using a laminator.
Subsequently, the adhesive layer was irradiated with ultraviolet rays through the polyethylene terephthalate film so that ultraviolet rays having a wavelength of 365 nm reached 1000 mJ / cm 2 and partially reacted with the crosslinking agent to produce an adhesive sheet 12 (thickness 150 μm). .
特許４９７１５２９号公報の実施例３に準じて粘着剤組成物１２を作製した。
すなわち、２－エチルヘキシルアクリレート７５質量部と酢酸ビニル２０質量部とアクリル酸５質量部とをランダム共重合してなるアクリル酸エステル共重合体前記アクリル酸エステル共重合体（Ａ－３）１ｋｇに、架橋剤（Ｂ）としてノナンジオールジアクリレート（Ｖ＃２６０，大阪有機化学社製）（Ｂ－４）５０ｇ及び光重合開始剤（Ｃ）として４－メチルベンゾフェノン（Ｃ－３）１０ｇを混合添加して粘着剤樹脂組成物１２を調製した。
そして、実施例１と同様に、剥離フィルム１，２とで該粘着剤樹脂組成物１２を挟み、ラミネータを用いて厚さ１５０μｍとなるようシート状に賦形した。
続いて、ポリエチレンテレフタレートフィルムを介して、粘着層に波長３６５ｎｍの紫外線が１０００ｍＪ／ｃｍ２到達するよう紫外線を照射し、架橋剤を一部反応させて、粘着シート１２（厚さ１５０μｍ）を作製した。 [Comparative Example 3]
A pressure-sensitive adhesive composition 12 was produced according to Example 3 of Japanese Patent No. 4971529.
That is, an acrylic ester copolymer obtained by random copolymerization of 75 parts by mass of 2-ethylhexyl acrylate, 20 parts by mass of vinyl acetate and 5 parts by mass of acrylic acid, into 1 kg of the acrylic ester copolymer (A-3), 50 g of nonanediol diacrylate (V # 260, manufactured by Osaka Organic Chemical Co., Ltd.) (B-4) as a crosslinking agent (B) and 10 g of 4-methylbenzophenone (C-3) as a photopolymerization initiator (C) were mixed and added. Thus, an adhesive resin composition 12 was prepared.
And like Example 1, this adhesive resin composition 12 was pinched | interposed with the peeling films 1 and 2, and it shape | molded in the sheet form so that it might become 150 micrometers in thickness using a laminator.
Subsequently, the adhesive layer was irradiated with ultraviolet rays through the polyethylene terephthalate film so that ultraviolet rays having a wavelength of 365 nm reached 1000 mJ / cm 2 and partially reacted with the crosslinking agent to produce an adhesive sheet 12 (thickness 150 μm). .
［比較例４］
液状接着剤樹脂組成物の比較例として、ポリイソブチレンジアクリレートオリゴマー（ＣＮ３１０，アルケマ社製）４６０ｇに対し、イソボルニルメタクリレート（ＩＢ－Ｘ，共栄社化学社製）４１０ｇと、テトラヒドロフルフリルアクリレート（ＳＲ２８５，アルケマ社製）１３０ｇの混合物を調整し、さらに可塑剤としての液状ポリブタジエン（ＲＹＣＯＮ１３４，クレイバレー社製）５４０ｇを加え、さらに光重合開始剤（Ｃ）として、ジフェニル－２，４，６－トリメチルベンゾイルホスフィンオキサイド（Ｃ－２）（オムニラッドＴＰＯ，ＩＧＭ社製）１７ｇ、１－ヒドロキシ－シクロヘキシルフェニルケトン（Ｃ－３）３３ｇ（イルガキュア１８４，ＢＡＳＦ社製）と、波長変換剤（Ｄ）としての２，５－ビス（５－ｔ－ブチル－２－ベンゾオキサゾリル）チオフェン（Ｄ－１）０．１６ｇを加えて樹脂組成物１３を作製した。なお、この組成物は液状であり、シート形状に賦形することはできなかった。 [Comparative Example 4]
As a comparative example of the liquid adhesive resin composition, 460 g of polyisobutylene diacrylate oligomer (CN310, manufactured by Arkema), 410 g of isobornyl methacrylate (IB-X, manufactured by Kyoeisha Chemical Co., Ltd.), and tetrahydrofurfuryl acrylate (SR285) , Manufactured by Arkema Co., Ltd.) 130 g of a mixture, liquid polybutadiene (RYCON134, manufactured by Clay Valley) 540 g as a plasticizer was added, and diphenyl-2,4,6-trimethyl was used as a photopolymerization initiator (C). 17 g of benzoylphosphine oxide (C-2) (Omnirad TPO, manufactured by IGM), 33 g of 1-hydroxy-cyclohexyl phenyl ketone (C-3) (Irgacure 184, manufactured by BASF), and 2 as a wavelength converting agent (D) , 5-Bis (5-t-butyl 2-benzoxazolyl) thiophene (D-1) was added to 0.16g to prepare a resin composition 13. This composition was in a liquid form and could not be formed into a sheet shape.
液状接着剤樹脂組成物の比較例として、ポリイソブチレンジアクリレートオリゴマー（ＣＮ３１０，アルケマ社製）４６０ｇに対し、イソボルニルメタクリレート（ＩＢ－Ｘ，共栄社化学社製）４１０ｇと、テトラヒドロフルフリルアクリレート（ＳＲ２８５，アルケマ社製）１３０ｇの混合物を調整し、さらに可塑剤としての液状ポリブタジエン（ＲＹＣＯＮ１３４，クレイバレー社製）５４０ｇを加え、さらに光重合開始剤（Ｃ）として、ジフェニル－２，４，６－トリメチルベンゾイルホスフィンオキサイド（Ｃ－２）（オムニラッドＴＰＯ，ＩＧＭ社製）１７ｇ、１－ヒドロキシ－シクロヘキシルフェニルケトン（Ｃ－３）３３ｇ（イルガキュア１８４，ＢＡＳＦ社製）と、波長変換剤（Ｄ）としての２，５－ビス（５－ｔ－ブチル－２－ベンゾオキサゾリル）チオフェン（Ｄ－１）０．１６ｇを加えて樹脂組成物１３を作製した。なお、この組成物は液状であり、シート形状に賦形することはできなかった。 [Comparative Example 4]
As a comparative example of the liquid adhesive resin composition, 460 g of polyisobutylene diacrylate oligomer (CN310, manufactured by Arkema), 410 g of isobornyl methacrylate (IB-X, manufactured by Kyoeisha Chemical Co., Ltd.), and tetrahydrofurfuryl acrylate (SR285) , Manufactured by Arkema Co., Ltd.) 130 g of a mixture, liquid polybutadiene (RYCON134, manufactured by Clay Valley) 540 g as a plasticizer was added, and diphenyl-2,4,6-trimethyl was used as a photopolymerization initiator (C). 17 g of benzoylphosphine oxide (C-2) (Omnirad TPO, manufactured by IGM), 33 g of 1-hydroxy-cyclohexyl phenyl ketone (C-3) (Irgacure 184, manufactured by BASF), and 2 as a wavelength converting agent (D) , 5-Bis (5-t-butyl 2-benzoxazolyl) thiophene (D-1) was added to 0.16g to prepare a resin composition 13. This composition was in a liquid form and could not be formed into a sheet shape.
［評価］
実施例・比較例で得られたサンプルについて、以下の方法で各項目について評価した。 [Evaluation]
About the sample obtained by the Example and the comparative example, it evaluated about each item with the following method.
実施例・比較例で得られたサンプルについて、以下の方法で各項目について評価した。 [Evaluation]
About the sample obtained by the Example and the comparative example, it evaluated about each item with the following method.
（ゲル分率）
黒色シート（ＬＳＬ－８ イノアック社製 光線透過率０％）の片面に両面テープを貼り、５０ｍｍ×２００ｍｍに裁断して遮光シートを作成した。
実施例１～８及び比較例１～３で作成した粘着シートについて、一方の剥離フィルム２の表面に上述の遮光シートを貼合し、一部を隠蔽した積層体を作成した。但し、比較例４の粘着剤組成物１３については、前述の遮光シートを剥離フィルム２に貼り合せて作製した、隠蔽箇所付きの剥離フィルム２と、剥離フィルム１との間に、粘着剤組成物１３を厚さ１５０μｍとなるよう挟持して積層体を作成した。 (Gel fraction)
A double-sided tape was affixed to one side of a black sheet (LSL-8 manufactured by Inoac Co., Ltd., light transmittance 0%), and cut into 50 mm × 200 mm to prepare a light shielding sheet.
For the pressure-sensitive adhesive sheets prepared in Examples 1 to 8 and Comparative Examples 1 to 3, the above-described light-shielding sheet was bonded to the surface of one release film 2 to prepare a laminate in which a part was concealed. However, for the pressure-sensitive adhesive composition 13 of Comparative Example 4, the pressure-sensitive adhesive composition was provided between the release film 1 with the concealed portion and the release film 1 produced by bonding the above-described light-shielding sheet to the release film 2. 13 was sandwiched so as to have a thickness of 150 μm to prepare a laminate.
黒色シート（ＬＳＬ－８ イノアック社製 光線透過率０％）の片面に両面テープを貼り、５０ｍｍ×２００ｍｍに裁断して遮光シートを作成した。
実施例１～８及び比較例１～３で作成した粘着シートについて、一方の剥離フィルム２の表面に上述の遮光シートを貼合し、一部を隠蔽した積層体を作成した。但し、比較例４の粘着剤組成物１３については、前述の遮光シートを剥離フィルム２に貼り合せて作製した、隠蔽箇所付きの剥離フィルム２と、剥離フィルム１との間に、粘着剤組成物１３を厚さ１５０μｍとなるよう挟持して積層体を作成した。 (Gel fraction)
A double-sided tape was affixed to one side of a black sheet (LSL-8 manufactured by Inoac Co., Ltd., light transmittance 0%), and cut into 50 mm × 200 mm to prepare a light shielding sheet.
For the pressure-sensitive adhesive sheets prepared in Examples 1 to 8 and Comparative Examples 1 to 3, the above-described light-shielding sheet was bonded to the surface of one release film 2 to prepare a laminate in which a part was concealed. However, for the pressure-sensitive adhesive composition 13 of Comparative Example 4, the pressure-sensitive adhesive composition was provided between the release film 1 with the concealed portion and the release film 1 produced by bonding the above-described light-shielding sheet to the release film 2. 13 was sandwiched so as to have a thickness of 150 μm to prepare a laminate.
次に、このように作成した積層体の遮光シート側から、高圧水銀ランプを用いて、波長３６５ｎｍの積算光量が２０００ｍＪ／ｃｍ２となるように粘着剤組成物に紫外線を照射し、粘着剤組成物を硬化させた。
光が遮蔽された箇所について、遮光シートの長辺側端面から１ｍｍまでの箇所をカッターで裁断し、粘着剤組成物のみを取り出したものについて、下記の方法を用いてゲル分率を測定した。硬化前の粘着剤組成物及び、露光箇所の粘着剤組成物についても、同様の手順でゲル分率を求めた。 Next, the pressure-sensitive adhesive composition is irradiated with ultraviolet rays from the light-shielding sheet side of the laminate thus prepared using a high-pressure mercury lamp so that the integrated light quantity at a wavelength of 365 nm is 2000 mJ / cm 2. The object was cured.
About the location where light was shielded, the portion from the long side end face of the light shielding sheet to 1 mm was cut with a cutter, and only the pressure-sensitive adhesive composition was taken out, and the gel fraction was measured using the following method. The gel fraction was calculated | required in the same procedure also about the adhesive composition before hardening and the adhesive composition of an exposure location.
光が遮蔽された箇所について、遮光シートの長辺側端面から１ｍｍまでの箇所をカッターで裁断し、粘着剤組成物のみを取り出したものについて、下記の方法を用いてゲル分率を測定した。硬化前の粘着剤組成物及び、露光箇所の粘着剤組成物についても、同様の手順でゲル分率を求めた。 Next, the pressure-sensitive adhesive composition is irradiated with ultraviolet rays from the light-shielding sheet side of the laminate thus prepared using a high-pressure mercury lamp so that the integrated light quantity at a wavelength of 365 nm is 2000 mJ / cm 2. The object was cured.
About the location where light was shielded, the portion from the long side end face of the light shielding sheet to 1 mm was cut with a cutter, and only the pressure-sensitive adhesive composition was taken out, and the gel fraction was measured using the following method. The gel fraction was calculated | required in the same procedure also about the adhesive composition before hardening and the adhesive composition of an exposure location.
＜ゲル分率測定方法＞
１）粘着剤組成物を秤量し（Ｗ１）、予め重さを測ったＳＵＳメッシュ（Ｗ０）に包む。
２）上記ＳＵＳメッシュを１００ｍＬの酢酸エチルに２４時間浸漬する。
３）ＳＵＳメッシュを取り出し、７５℃で４時間半乾燥する。
４）乾燥後の重量（Ｗ２）を求め、下記式より粘着剤組成物のゲル分率を測定する。
ゲル分率（％）＝１００×（Ｗ２－Ｗ０）／Ｗ１ <Gel fraction measurement method>
1) The pressure-sensitive adhesive composition is weighed (W 1 ) and wrapped in a pre-weighed SUS mesh (W 0 ).
2) The SUS mesh is immersed in 100 mL of ethyl acetate for 24 hours.
3) Take out the SUS mesh and dry at 75 ° C. for 4 and a half hours.
4) The weight (W 2 ) after drying is determined, and the gel fraction of the pressure-sensitive adhesive composition is measured from the following formula.
Gel fraction (%) = 100 × (W 2 −W 0 ) / W 1
１）粘着剤組成物を秤量し（Ｗ１）、予め重さを測ったＳＵＳメッシュ（Ｗ０）に包む。
２）上記ＳＵＳメッシュを１００ｍＬの酢酸エチルに２４時間浸漬する。
３）ＳＵＳメッシュを取り出し、７５℃で４時間半乾燥する。
４）乾燥後の重量（Ｗ２）を求め、下記式より粘着剤組成物のゲル分率を測定する。
ゲル分率（％）＝１００×（Ｗ２－Ｗ０）／Ｗ１ <Gel fraction measurement method>
1) The pressure-sensitive adhesive composition is weighed (W 1 ) and wrapped in a pre-weighed SUS mesh (W 0 ).
2) The SUS mesh is immersed in 100 mL of ethyl acetate for 24 hours.
3) Take out the SUS mesh and dry at 75 ° C. for 4 and a half hours.
4) The weight (W 2 ) after drying is determined, and the gel fraction of the pressure-sensitive adhesive composition is measured from the following formula.
Gel fraction (%) = 100 × (W 2 −W 0 ) / W 1
（接着力）
実施例１～８及び比較例１～３で作成した粘着シートについて、一方の剥離フィルム２を剥がして、裏打ちフィルムとして５０μｍのＰＥＴフィルム（三菱樹脂社製ダイアホイルＴ１００、厚さ５０μｍ）を貼合した。
上記積層品を長さ１５０ｍｍ、巾１０ｍｍに裁断した後、残る剥離フィルム１を剥がして露出した粘着面をソーダライムガラスにロール圧着した。
このようにして得られた貼合品に、オートクレーブ処理（８０℃，ゲージ圧０．２ＭＰａ，３０分）を施して仕上げ貼着した後、裏打ちＰＥＴフィルム側から、３６５ｎｍの積算光量が２０００ｍＪ／ｃｍ2となるよう紫外線を照射して粘着シートを硬化させ、２３℃、５０％ＲＨで１５時間養生して、剥離力測定試料とした。 (Adhesive strength)
For the pressure-sensitive adhesive sheets prepared in Examples 1 to 8 and Comparative Examples 1 to 3, one release film 2 was peeled off, and a 50 μm PET film (Diafoil T100 manufactured by Mitsubishi Plastics, thickness 50 μm) was bonded as the backing film. did.
After the laminated product was cut to a length of 150 mm and a width of 10 mm, the remaining release film 1 was peeled off and the exposed adhesive surface was roll-bonded to soda lime glass.
After the autoclave treatment (80 ° C., gauge pressure 0.2 MPa, 30 minutes) was applied to the bonded product thus obtained and finished, the integrated light quantity at 365 nm was 2000 mJ / cm from the backing PET film side. The pressure-sensitive adhesive sheet was cured by irradiating with ultraviolet rays so as to be 2, and cured at 23 ° C. and 50% RH for 15 hours to obtain a peel strength measurement sample.
実施例１～８及び比較例１～３で作成した粘着シートについて、一方の剥離フィルム２を剥がして、裏打ちフィルムとして５０μｍのＰＥＴフィルム（三菱樹脂社製ダイアホイルＴ１００、厚さ５０μｍ）を貼合した。
上記積層品を長さ１５０ｍｍ、巾１０ｍｍに裁断した後、残る剥離フィルム１を剥がして露出した粘着面をソーダライムガラスにロール圧着した。
このようにして得られた貼合品に、オートクレーブ処理（８０℃，ゲージ圧０．２ＭＰａ，３０分）を施して仕上げ貼着した後、裏打ちＰＥＴフィルム側から、３６５ｎｍの積算光量が２０００ｍＪ／ｃｍ2となるよう紫外線を照射して粘着シートを硬化させ、２３℃、５０％ＲＨで１５時間養生して、剥離力測定試料とした。 (Adhesive strength)
For the pressure-sensitive adhesive sheets prepared in Examples 1 to 8 and Comparative Examples 1 to 3, one release film 2 was peeled off, and a 50 μm PET film (Diafoil T100 manufactured by Mitsubishi Plastics, thickness 50 μm) was bonded as the backing film. did.
After the laminated product was cut to a length of 150 mm and a width of 10 mm, the remaining release film 1 was peeled off and the exposed adhesive surface was roll-bonded to soda lime glass.
After the autoclave treatment (80 ° C., gauge pressure 0.2 MPa, 30 minutes) was applied to the bonded product thus obtained and finished, the integrated light quantity at 365 nm was 2000 mJ / cm from the backing PET film side. The pressure-sensitive adhesive sheet was cured by irradiating with ultraviolet rays so as to be 2, and cured at 23 ° C. and 50% RH for 15 hours to obtain a peel strength measurement sample.
比較例４の粘着剤組成物１３については、ソーダライムガラス上に厚さ１５０μｍとなるよう塗布した後、裏打ちフィルムとしての５０μｍＰＥＴフィルム（三菱樹脂社製ダイアホイルＴ１００ 厚さ５０μｍ）を貼合した。 裏打ちＰＥＴフィルム側から、３６５ｎｍの積算光量が２０００ｍＪ／ｃｍ2となるよう紫外線を照射して粘着シートを硬化させた後、硬化物に巾１０ｍｍの短冊状になるようカッターで切り込みを入れ、剥離力測定試料とした。
About the adhesive composition 13 of the comparative example 4, after apply | coating so that it might become thickness 150micrometer on soda-lime glass, 50 micrometer PET film (Mitsubishi Resin Diafoil T100 thickness 50micrometer) was bonded. After the adhesive sheet is cured by irradiating ultraviolet rays so that the integrated light amount at 365 nm is 2000 mJ / cm 2 from the backing PET film side, the cured product is cut with a cutter so as to form a strip with a width of 10 mm, and the peeling force A measurement sample was obtained.
上記剥離力測定試料を、２３℃４０％ＲＨの環境下にて剥離角１８０°、剥離速度６０ｍｍ／分で引き剥がしたときのガラスへの剥離力（Ｎ／ｃｍ）を測定した。
The peeling force (N / cm) to the glass when the above-mentioned peeling force measurement sample was peeled at a peeling angle of 180 ° and a peeling speed of 60 mm / min in an environment of 23 ° C. and 40% RH was measured.
（段差追従性）
６０ｍｍ×９０ｍｍ×厚さ０．５ｍｍのソーダライムガラスの周縁部に、幅５ｍｍ、厚み４０μｍの印刷（全光線透過率０％）を施し、周縁部に４０μｍの印刷段差をもつ評価用ガラス基板を作製した。この評価用ガラス基板は、段差部を伴う隠蔽部を貼合面に有する画像表示装置構成部材の代替品である。 (Step following capability)
60 mm × 90 mm × 0.5 mm thick soda lime glass peripheral edge is printed with a width of 5 mm and thickness of 40 μm (total light transmittance 0%), and the evaluation glass substrate has a 40 μm printed step on the peripheral edge. Produced. This glass substrate for evaluation is a substitute for an image display device constituent member having a concealing portion with a stepped portion on the bonding surface.
６０ｍｍ×９０ｍｍ×厚さ０．５ｍｍのソーダライムガラスの周縁部に、幅５ｍｍ、厚み４０μｍの印刷（全光線透過率０％）を施し、周縁部に４０μｍの印刷段差をもつ評価用ガラス基板を作製した。この評価用ガラス基板は、段差部を伴う隠蔽部を貼合面に有する画像表示装置構成部材の代替品である。 (Step following capability)
60 mm × 90 mm × 0.5 mm thick soda lime glass peripheral edge is printed with a width of 5 mm and thickness of 40 μm (total light transmittance 0%), and the evaluation glass substrate has a 40 μm printed step on the peripheral edge. Produced. This glass substrate for evaluation is a substitute for an image display device constituent member having a concealing portion with a stepped portion on the bonding surface.
上記ガラス基板の印刷面に、実施例１～８及び比較例１～３で作成した粘着シートの一方の剥離フィルム２を剥がして１ｋｇのロールを２往復させ、周縁部の印刷段差を覆うように、粘着シートを貼合した。次いで、残る剥離フィルム１を剥がし、露出した粘着面にシクロオレフィンポリマーフィルム（厚さ１００μｍ）を減圧下（絶対圧５ｋＰa）８０℃にてプレス圧０．０２ＭＰaにてプレス貼合した後、オートクレーブ処理（６０℃，０．２ＭＰａ，２０分）を施して仕上げ貼着した。
One release film 2 of the pressure-sensitive adhesive sheet prepared in Examples 1 to 8 and Comparative Examples 1 to 3 is peeled off on the printing surface of the glass substrate, and a 1 kg roll is reciprocated twice to cover the printing step at the periphery. The adhesive sheet was pasted. Next, the remaining release film 1 is peeled off, and a cycloolefin polymer film (thickness: 100 μm) is press bonded at 80 ° C. under a reduced pressure (absolute pressure 5 kPa) at a pressing pressure of 0.02 MPa on the exposed adhesive surface, followed by autoclave treatment. (60 ° C., 0.2 MPa, 20 minutes) was applied and finished.
比較例４の樹脂組成物１３については、樹脂組成物１２を厚み１５０μｍとなるよう直接ガラス基板に直接塗布した後、シクロオレフィンポリマーフィルム（厚さ１００μｍ）を被覆した。上記積層体に、ガラス基板側から、高圧水銀ランプを用いて、３６５ｎｍの波長の光が粘着剤組成物に２０００ｍＪ／ｃｍ２到達するように紫外線照射した。
For the resin composition 13 of Comparative Example 4, the resin composition 12 was directly applied to a glass substrate so as to have a thickness of 150 μm, and then a cycloolefin polymer film (thickness 100 μm) was coated. The laminate was irradiated with ultraviolet rays from the glass substrate side using a high-pressure mercury lamp so that light having a wavelength of 365 nm reached the pressure-sensitive adhesive composition at 2000 mJ / cm 2 .
作成した積層体を目視観察し、フィルムが段差近傍で屈曲し、歪むことによる凹凸ムラが見えたものを「×」、気泡なく平滑に貼合されたものを「○」と判定した。
The prepared laminate was visually observed, and the film was bent in the vicinity of the step and the unevenness due to distortion was seen as “x”, and the film smoothly bonded without bubbles was judged as “◯”.
（保管安定性）
段差追従性評価で作成した評価用積層体について、印刷箇所の粘着剤組成物を目視観察した。
８５℃のオーブンで６時間加熱した後も目視観察し、印刷箇所直下の粘着剤組成物が加熱試験前から流れてはみだしているものを「×」、加熱養生後に、粘着剤組成物が流れていたものを「△」、加熱試験を通して粘着の潰れやはみだしがみられなかったものを「○」と判定した。 (Storage stability)
About the laminated body for evaluation created by level | step difference followable | trackability evaluation, the adhesive composition of a printing location was observed visually.
Even after heating in an oven at 85 ° C. for 6 hours, the adhesive composition immediately below the printing location is “X” where the adhesive composition flows out from before the heating test, and the adhesive composition flows after the heat curing. The sample was evaluated as “Δ”, and the sample in which no crushing or sticking of adhesive was observed through the heating test was determined as “◯”.
段差追従性評価で作成した評価用積層体について、印刷箇所の粘着剤組成物を目視観察した。
８５℃のオーブンで６時間加熱した後も目視観察し、印刷箇所直下の粘着剤組成物が加熱試験前から流れてはみだしているものを「×」、加熱養生後に、粘着剤組成物が流れていたものを「△」、加熱試験を通して粘着の潰れやはみだしがみられなかったものを「○」と判定した。 (Storage stability)
About the laminated body for evaluation created by level | step difference followable | trackability evaluation, the adhesive composition of a printing location was observed visually.
Even after heating in an oven at 85 ° C. for 6 hours, the adhesive composition immediately below the printing location is “X” where the adhesive composition flows out from before the heating test, and the adhesive composition flows after the heat curing. The sample was evaluated as “Δ”, and the sample in which no crushing or sticking of adhesive was observed through the heating test was determined as “◯”.
（全光線透過率、ヘイズ）
段差追従性評価で作成した積層体について、ヘイズメーター（日本電色工業株式会社製 ＮＤＨ５０００）を用いて、全光線透過率並びにヘイズ値をＪＩＳ Ｋ７３６１－１並びにＪＩＳ Ｋ７１３６に準じて測定した。 (Total light transmittance, haze)
About the laminated body created by level | step difference followable | trackability evaluation, the total light transmittance and the haze value were measured according to JISK7361-1 and JISK7136 using the haze meter (Nippon Denshoku Industries Co., Ltd. NDH5000).
段差追従性評価で作成した積層体について、ヘイズメーター（日本電色工業株式会社製 ＮＤＨ５０００）を用いて、全光線透過率並びにヘイズ値をＪＩＳ Ｋ７３６１－１並びにＪＩＳ Ｋ７１３６に準じて測定した。 (Total light transmittance, haze)
About the laminated body created by level | step difference followable | trackability evaluation, the total light transmittance and the haze value were measured according to JISK7361-1 and JISK7136 using the haze meter (Nippon Denshoku Industries Co., Ltd. NDH5000).
（分光透過率、吸光度）
段差追従性評価で作成した積層体について、分光光度計（島津製作所社製 ＵＶ２０００）を用いて、波長３００ｎｍ～５００ｎｍの分光透過率（Ｔ％）を測定した。３９０ｎｍの波長における透過率から下記式より粘着シートの吸光度Ｘを算出し、粘着シート厚みＹ（ｍｍ）を除して、Ｘ／Ｙを求めた。
Ｘ＝－Ｌｏｇ（Ｔ／１００） (Spectral transmittance, absorbance)
With respect to the laminate prepared by the step followability evaluation, the spectral transmittance (T%) at a wavelength of 300 nm to 500 nm was measured using a spectrophotometer (UV2000, manufactured by Shimadzu Corporation). From the transmittance at a wavelength of 390 nm, the absorbance X of the pressure-sensitive adhesive sheet was calculated from the following formula, and the pressure-sensitive adhesive sheet thickness Y (mm) was divided to obtain X / Y.
X = -Log (T / 100)
段差追従性評価で作成した積層体について、分光光度計（島津製作所社製 ＵＶ２０００）を用いて、波長３００ｎｍ～５００ｎｍの分光透過率（Ｔ％）を測定した。３９０ｎｍの波長における透過率から下記式より粘着シートの吸光度Ｘを算出し、粘着シート厚みＹ（ｍｍ）を除して、Ｘ／Ｙを求めた。
Ｘ＝－Ｌｏｇ（Ｔ／１００） (Spectral transmittance, absorbance)
With respect to the laminate prepared by the step followability evaluation, the spectral transmittance (T%) at a wavelength of 300 nm to 500 nm was measured using a spectrophotometer (UV2000, manufactured by Shimadzu Corporation). From the transmittance at a wavelength of 390 nm, the absorbance X of the pressure-sensitive adhesive sheet was calculated from the following formula, and the pressure-sensitive adhesive sheet thickness Y (mm) was divided to obtain X / Y.
X = -Log (T / 100)
（剥離フィルムの分光透過率）
実施例２，９で作製時に用いた剥離フィルム１、３について、分光光度計（島津製作所社製、ＵＶ２０００）を用いて、波長３００ｎｍ～５００ｎｍの分光透過率（Ｔ％）を測定した。
また、実施例２，９で作製した粘着シート２，９について、前記粘着シート２は剥離フィルム１を上にして、前記粘着シート９は剥離フィルム３を上にしてそれぞれ平置きして、蛍光灯下（環境照度１１７０ルクス）にて、１日間保管した。そして、１日間保管後の粘着シート２，９のゲル分率を、上述のゲル分率測定方法に準じて算出した。測定結果を表２に示す。 (Spectral transmittance of release film)
For the release films 1 and 3 used in production in Examples 2 and 9, the spectral transmittance (T%) at a wavelength of 300 nm to 500 nm was measured using a spectrophotometer (manufactured by Shimadzu Corporation, UV2000).
Further, for the pressure-sensitive adhesive sheets 2 and 9 produced in Examples 2 and 9, the pressure-sensitive adhesive sheet 2 was placed flat with the release film 1 facing up, and the pressure-sensitive adhesive sheet 9 was placed flat with the release film 3 facing up, and a fluorescent lamp The product was stored for 1 day at the bottom (environmental illumination 1170 lux). And the gel fraction of the adhesive sheets 2 and 9 after 1-day storage was computed according to the above-mentioned gel fraction measuring method. The measurement results are shown in Table 2.
実施例２，９で作製時に用いた剥離フィルム１、３について、分光光度計（島津製作所社製、ＵＶ２０００）を用いて、波長３００ｎｍ～５００ｎｍの分光透過率（Ｔ％）を測定した。
また、実施例２，９で作製した粘着シート２，９について、前記粘着シート２は剥離フィルム１を上にして、前記粘着シート９は剥離フィルム３を上にしてそれぞれ平置きして、蛍光灯下（環境照度１１７０ルクス）にて、１日間保管した。そして、１日間保管後の粘着シート２，９のゲル分率を、上述のゲル分率測定方法に準じて算出した。測定結果を表２に示す。 (Spectral transmittance of release film)
For the release films 1 and 3 used in production in Examples 2 and 9, the spectral transmittance (T%) at a wavelength of 300 nm to 500 nm was measured using a spectrophotometer (manufactured by Shimadzu Corporation, UV2000).
Further, for the pressure-sensitive adhesive sheets 2 and 9 produced in Examples 2 and 9, the pressure-sensitive adhesive sheet 2 was placed flat with the release film 1 facing up, and the pressure-sensitive adhesive sheet 9 was placed flat with the release film 3 facing up, and a fluorescent lamp The product was stored for 1 day at the bottom (environmental illumination 1170 lux). And the gel fraction of the adhesive sheets 2 and 9 after 1-day storage was computed according to the above-mentioned gel fraction measuring method. The measurement results are shown in Table 2.
［考察］
実施例の粘着剤組成物は、貼合時に高い流動性をもつ結果、段差追従性に優れるばかりか、波長変換剤が隠蔽箇所の硬化促進に寄与するため、印刷下部の硬化も進行し、保管安定性にも優れることが分かった。 [Discussion]
As a result of having high fluidity at the time of pasting, the pressure-sensitive adhesive composition of the example not only has excellent step following ability, but also the wavelength conversion agent contributes to the acceleration of curing of the concealed portion, so that the curing of the lower part of the printing also proceeds and stored. It was found to be excellent in stability.
実施例の粘着剤組成物は、貼合時に高い流動性をもつ結果、段差追従性に優れるばかりか、波長変換剤が隠蔽箇所の硬化促進に寄与するため、印刷下部の硬化も進行し、保管安定性にも優れることが分かった。 [Discussion]
As a result of having high fluidity at the time of pasting, the pressure-sensitive adhesive composition of the example not only has excellent step following ability, but also the wavelength conversion agent contributes to the acceleration of curing of the concealed portion, so that the curing of the lower part of the printing also proceeds and stored. It was found to be excellent in stability.
これに対し、比較例１は、波長変換剤を含有していないため、印刷段差箇所の粘着剤組成物が一部流動し、高温での保管安定性が充分とはいえない結果となった。
比較例２は、波長変換剤による吸光度が高いために光架橋に必要な光が重合組成物の深部まで到達せず、直接露光した箇所でさえも光硬化反応が十分に進行しない結果となった。
比較例３は、波長変換剤が含まれていないものの、部材に貼合する前に１次架橋を施していたため、優れた保管安定性は得られたものの、貼合時にフィルムが段差近傍で屈曲し、段差吸収性が十分に得られなかった。
比較例４は、液状の粘着剤組成物であり、任意に流動するため段差吸収性には優れるものの、印刷下など硬化しにくい箇所での樹脂のはみだしがみられ、保管安定性が不十分であった。また、アクリル系共重合体を含まないため、硬化物にはタック性がなく、被着体への接着力に劣るものであった。尚、比較例４における隠蔽箇所のゲル分率値については、一部が液状で残存していたために、樹脂組成物を被着体から全て採取することができず、正確なゲル分率値を得ることができなかった。 On the other hand, since Comparative Example 1 did not contain a wavelength conversion agent, the pressure-sensitive adhesive composition at the printing step portion partially flowed, and the storage stability at high temperature was not sufficient.
In Comparative Example 2, the light necessary for photocrosslinking did not reach the deep part of the polymerization composition because of the high absorbance by the wavelength converting agent, and the photocuring reaction did not proceed sufficiently even at the directly exposed locations. .
Although the comparative example 3 did not contain the wavelength conversion agent, it was subjected to primary cross-linking before being bonded to the member. Therefore, although excellent storage stability was obtained, the film was bent in the vicinity of the step at the time of bonding. However, the step absorbability was not sufficiently obtained.
Comparative Example 4 is a liquid pressure-sensitive adhesive composition, which is excellent in step absorbability because it flows arbitrarily, but the resin sticks out in places that are difficult to cure such as under printing, and the storage stability is insufficient. there were. Moreover, since an acrylic copolymer was not included, the cured product had no tackiness and was inferior in adhesion to an adherend. In addition, about the gel fraction value of the concealment part in the comparative example 4, since a part remained in a liquid state, it was not possible to collect all the resin composition from the adherend, and an accurate gel fraction value was obtained. Couldn't get.
比較例２は、波長変換剤による吸光度が高いために光架橋に必要な光が重合組成物の深部まで到達せず、直接露光した箇所でさえも光硬化反応が十分に進行しない結果となった。
比較例３は、波長変換剤が含まれていないものの、部材に貼合する前に１次架橋を施していたため、優れた保管安定性は得られたものの、貼合時にフィルムが段差近傍で屈曲し、段差吸収性が十分に得られなかった。
比較例４は、液状の粘着剤組成物であり、任意に流動するため段差吸収性には優れるものの、印刷下など硬化しにくい箇所での樹脂のはみだしがみられ、保管安定性が不十分であった。また、アクリル系共重合体を含まないため、硬化物にはタック性がなく、被着体への接着力に劣るものであった。尚、比較例４における隠蔽箇所のゲル分率値については、一部が液状で残存していたために、樹脂組成物を被着体から全て採取することができず、正確なゲル分率値を得ることができなかった。 On the other hand, since Comparative Example 1 did not contain a wavelength conversion agent, the pressure-sensitive adhesive composition at the printing step portion partially flowed, and the storage stability at high temperature was not sufficient.
In Comparative Example 2, the light necessary for photocrosslinking did not reach the deep part of the polymerization composition because of the high absorbance by the wavelength converting agent, and the photocuring reaction did not proceed sufficiently even at the directly exposed locations. .
Although the comparative example 3 did not contain the wavelength conversion agent, it was subjected to primary cross-linking before being bonded to the member. Therefore, although excellent storage stability was obtained, the film was bent in the vicinity of the step at the time of bonding. However, the step absorbability was not sufficiently obtained.
Comparative Example 4 is a liquid pressure-sensitive adhesive composition, which is excellent in step absorbability because it flows arbitrarily, but the resin sticks out in places that are difficult to cure such as under printing, and the storage stability is insufficient. there were. Moreover, since an acrylic copolymer was not included, the cured product had no tackiness and was inferior in adhesion to an adherend. In addition, about the gel fraction value of the concealment part in the comparative example 4, since a part remained in a liquid state, it was not possible to collect all the resin composition from the adherend, and an accurate gel fraction value was obtained. Couldn't get.
また、実施例９の結果より、波長３８０ｎｍより短波長側の光の光線透過率が４０％以下の剥離フィルムを備えた構成とすることで、使用前の粘着シートにおけるゲル化の進行を抑えることができることが分かった。
Moreover, from the result of Example 9, by setting it as the structure provided with the peeling film whose light transmittance of the light shorter than the wavelength of 380 nm is 40% or less, the progress of gelation in the pressure-sensitive adhesive sheet before use is suppressed. I found out that
Claims (6)
- 熱可塑性樹脂（Ａ）、架橋剤（Ｂ）、少なくとも波長３８０ｎｍ～４３０ｎｍの光で反応する光重合開始剤（Ｃ）、及び、波長３８０ｎｍより短波長側の光で励起され、波長３８０ｎｍ～５５０ｎｍの光を発光する波長変換剤（Ｄ）を含有する粘着剤組成物からなる透明粘着シートであって、
波長３９０ｎｍにおける粘着シートの吸光度Ｘと、粘着シートの厚みＹとが次の関係式（１）を満足することを特徴とする透明粘着シート。
式（１）・・・０．５≦Ｘ／Ｙ≦１２ A thermoplastic resin (A), a crosslinking agent (B), a photopolymerization initiator (C) that reacts with at least light having a wavelength of 380 nm to 430 nm, and excited with light having a wavelength shorter than 380 nm, and having a wavelength of 380 nm to 550 nm A transparent pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive composition containing a wavelength converting agent (D) that emits light,
A transparent adhesive sheet, wherein the absorbance X of the adhesive sheet at a wavelength of 390 nm and the thickness Y of the adhesive sheet satisfy the following relational expression (1).
Formula (1) ... 0.5 <= X / Y <= 12 - 波長変換剤（Ｄ）は、熱可塑性樹脂（Ａ）に相溶する材料であることを特徴とする請求項１に記載の透明粘着シート。 2. The transparent adhesive sheet according to claim 1, wherein the wavelength converting agent (D) is a material compatible with the thermoplastic resin (A).
- 透明粘着シートは、未架橋状態において加熱により軟化乃至流動するホットメルト性を有すると共に、光で架橋する光架橋性を有することを特徴とする請求項１又は２に記載の透明粘着シート。 The transparent adhesive sheet according to claim 1, wherein the transparent adhesive sheet has a hot-melt property that softens or flows when heated in an uncrosslinked state, and has a photo-crosslinkability that crosslinks with light.
- 熱可塑性樹脂（Ａ）が、枝成分としてマクロモノマーを備えたグラフト共重合体からなるアクリル系共重合体であることを特徴とする、請求項１～３の何れかに記載の透明粘着シート。 The transparent pressure-sensitive adhesive sheet according to any one of claims 1 to 3, wherein the thermoplastic resin (A) is an acrylic copolymer comprising a graft copolymer having a macromonomer as a branch component.
- 熱可塑性樹脂（Ａ）が、ガラス転移温度（Ｔｇ）が０℃未満のモノマーａと、ガラス転移温度（Ｔｇ）が０℃以上８０℃未満のモノマーｂと、ガラス転移温度（Ｔｇ）が８０℃以上のモノマーｃとが、ａ：ｂ：ｃ＝１０～４０：９０～３５：０～２５のモル比率で共重合してなり、重量平均分子量５００００～４０００００の（メタ）アクリル酸エステル共重合体もしくはビニル共重合体を含有する樹脂であることを特徴とする、請求項１～３の何れかに記載の透明粘着シート。 The thermoplastic resin (A) includes a monomer a having a glass transition temperature (Tg) of less than 0 ° C., a monomer b having a glass transition temperature (Tg) of from 0 ° C. to less than 80 ° C., and a glass transition temperature (Tg) of 80 ° C. (Meth) acrylic acid ester copolymer having a weight average molecular weight of 50,000 to 400,000, which is copolymerized with the above monomer c at a molar ratio of a: b: c = 10 to 40:90 to 35: 0 to 25 4. The transparent pressure-sensitive adhesive sheet according to claim 1, wherein the transparent pressure-sensitive adhesive sheet is a resin containing a vinyl copolymer.
- 表裏一側又は両側に剥離フィルムを備えた粘着シートであって、少なくとも表裏一側の前記剥離フィルムが、波長３８０ｎｍより短波長側の光の光線透過率が４０％以下であるフィルムであることを特徴とする請求項１～５の何れかに記載の透明粘着シート。
A pressure-sensitive adhesive sheet provided with a release film on one side or both sides, wherein at least the release film on one side of the front and back sides is a film having a light transmittance of 40% or less for light having a wavelength shorter than 380 nm. The transparent adhesive sheet according to any one of claims 1 to 5, wherein
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| US15/324,006 US10611932B2 (en) | 2014-08-12 | 2015-08-12 | Transparent adhesive sheet |
| CN201580032585.8A CN106459695B (en) | 2014-08-12 | 2015-08-12 | Transparent adhesive sheet |
| KR1020167035146A KR101907570B1 (en) | 2014-08-12 | 2015-08-12 | Transparent adhesive sheet |
| JP2016542606A JP6361734B2 (en) | 2014-08-12 | 2015-08-12 | Transparent adhesive sheet |
| CN202110040958.3A CN112724870B (en) | 2014-08-12 | 2015-08-12 | Transparent adhesive sheet |
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| JP (1) | JP6361734B2 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106459695A (en) | 2017-02-22 |
| US10611932B2 (en) | 2020-04-07 |
| JPWO2016024618A1 (en) | 2017-04-27 |
| KR20170008804A (en) | 2017-01-24 |
| CN106459695B (en) | 2021-01-12 |
| JP6361734B2 (en) | 2018-07-25 |
| US20170198175A1 (en) | 2017-07-13 |
| CN112724870A (en) | 2021-04-30 |
| KR101907570B1 (en) | 2018-10-12 |
| CN112724870B (en) | 2022-09-30 |
| TW201614021A (en) | 2016-04-16 |
| TWI666286B (en) | 2019-07-21 |
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